Polypeptides and polynucleotides, and uses thereof for treatment of immune related disorders and cancer

ABSTRACT

This invention relates to LY6G6F, VSIG10, TMEM25 and LSR proteins, which are suitable targets for immunotherapy, treatment of cancer, infectious disorders, and/or immune related disorders, and drug development. This invention further relates to soluble LY6G6F, VSIG10, TMEM25 and LSR molecules, extracellular domains of LY6G6F, VSIG10, TMEM25 and LSR and conjugates, which are suitable drugs for immunotherapy, treatment of cancer, infectious disorders, and/or immune related disorders. This invention further relates to antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, specific for LY6G6F, VSIG10, TMEM25 or LSR molecules, which are suitable drugs for immunotherapy, treatment of cancer, infectious disorders, and/or immune related disorders.

FIELD OF THE INVENTION

This invention relates to LY6G6F, VSIG10, TMEM25 and LSR proteins, which are suitable targets for immunotherapy, treatment of cancer, infectious disorders, and/or immune related disorders, and drug development, as well as soluble molecules and conjugates thereof, and antibodies against such.

BACKGROUND OF THE INVENTION

Naïve T cells must receive two independent signals from antigen-presenting cells (APC) in order to become productively activated. The first, Signal 1, is antigen-specific and occurs when T cell antigen receptors encounter the appropriate antigen-MHC complex on the APC. The fate of the immune response is determined by a second, antigen-independent signal (Signal 2) which is delivered through a T cell costimulatory molecule that engages its APC-expressed ligand. This second signal could be either stimulatory (positive costimulation) or inhibitory (negative costimulation or coinhibition). In the absence of a costimulatory signal, or in the presence of a coinhibitory signal, T-cell activation is impaired or aborted, which may lead to a state of antigen-specific unresponsiveness (known as T-cell anergy), or may result in T-cell apoptotic death.

Costimulatory molecule pairs usually consist of ligands expressed on APCs and their cognate receptors expressed on T cells. The prototype ligand/receptor pairs of costimulatory molecules are B7/CD28 and CD40/CD40L. The B7 family consists of structurally related, cell-surface protein ligands, which may provide stimulatory or inhibitory input to an immune response. Members of the B7 family are structurally related, with the extracellular domain containing at least one variable or constant immunoglobulin domain.

Both positive and negative costimulatory signals play critical roles in the regulation of cell-mediated immune responses, and molecules that mediate these signals have proven to be effective targets for immunomodulation. Based on this knowledge, several therapeutic approaches that involve targeting of costimulatory molecules have been developed, and were shown to be useful for prevention and treatment of cancer by turning on, or preventing the turning off, of immune responses in cancer patients and for prevention and treatment of autoimmune diseases and inflammatory diseases, as well as rejection of allogenic transplantation, each by turning off uncontrolled immune responses, or by induction of “off signal” by negative costimulation (or coinhibition) in subjects with these pathological conditions.

Manipulation of the signals delivered by B7 ligands has shown potential in the treatment of autoimmunity, inflammatory diseases, and transplant rejection. Therapeutic strategies include blocking of costimulation using monoclonal antibodies to the ligand or to the receptor of a costimulatory pair, or using soluble fusion proteins composed of the costimulatory receptor that may bind and block its appropriate ligand. Another approach is induction of co-inhibition using soluble fusion protein of an inhibitory ligand. These approaches rely, at least partially, on the eventual deletion of auto- or allo-reactive T cells (which are responsible for the pathogenic processes in autoimmune diseases or transplantation, respectively), presumably because in the absence of costimulation (which induces cell survival genes) T cells become highly susceptible to induction of apoptosis. Thus, novel agents that are capable of modulating costimulatory signals, without compromising the immune system's ability to defend against pathogens, are highly advantageous for treatment and prevention of such pathological conditions.

Costimulatory pathways play an important role in tumor development. Interestingly, tumors have been shown to evade immune destruction by impeding T cell activation through inhibition of co-stimulatory factors in the B7-CD28 and TNF families, as well as by attracting regulatory T cells, which inhibit anti-tumor T cell responses (see Wang (2006) Immune Suppression by Tumor Specific CD4+ Regulatory T cells in Cancer. Semin. Cancer. Biol. 16:73-79; Greenwald, et al. (2005) The B7 Family Revisited. Ann. Rev. Immunol. 23:515-48; Watts (2005) TNF/TNFR Family Members in Co-stimulation of T Cell Responses Ann. Rev. Immunol. 23:23-68; Sadum, et al. (2007) Immune Signatures of Murine and Human Cancers Reveal Unique Mechanisms of Tumor Escape and New Targets for Cancer Immunotherapy. Clin. Cane. Res. 13(13): 4016-4025). Such tumor expressed co-stimulatory molecules have become attractive cancer biomarkers and may serve as tumor-associated antigens (TAAs). Furthermore, costimulatory pathways have been identified as immunologic checkpoints that attenuate T cell dependent immune responses, both at the level of initiation and effector function within tumor metastases. As engineered cancer vaccines continue to improve, it is becoming clear that such immunologic checkpoints are a major barrier to the vaccines' ability to induce therapeutic anti-tumor responses. In that regard, costimulatory molecules can serve as adjuvants for active (vaccination) and passive (antibody-mediated) cancer immunotherapy, providing strategies to thwart immune tolerance and stimulate the immune system.

In addition, such agents could be of use in other types of cancer immunotherapy, such as adoptive immunotherapy, in which tumor-specific T cell populations are expanded and directed to attack and kill tumor cells. Agents capable of augmenting such anti-tumor response have great therapeutic potential and may be of value in the attempt to overcome the obstacles to tumor immunotherapy. Recently, novel agents that modulate several costimulatory pathways were indeed introduced to the clinic as cancer immunotherapy.

Emerging data from a wide range of studies on acute and chronic infections support an important role for negative costimulatory receptors also in controlling infection. Memory CD8 T cells generated after an acute viral infection are highly functional and constitute an important component of protective immunity. Modulation of costimulatory pathway has also been proven effective in optimizing antiviral immunity by limiting the memory T cell response to its protective capacities (Teijaro et al., J Immunol. 2009: 182; 5430-5438). This has been demonstrated in models of influenza infection in which inhibiting CD28 costimulation with CTLA4-Ig suppressed primary immune responses in naive mice infected with influenza, but was remarkably curative for memory CD4 T cell-mediated secondary responses to influenza leading to improved clinical outcome and increased survival to influenza challenge.

Chronic infections are often characterized by varying degrees of functional impairment of virus-specific T-cell responses, and this defect is a principal reason for the inability of the host to eliminate the persisting pathogen. Although functional effector T cells are initially generated during the early stages of infection, they gradually lose function during the course of the chronic infection as a result of persistant exposure to foreign antigen, giving rise to T cell exhaustion. Exhausted T cells express high levels of multiple co-inhibitory receptors such as CTLA-4, PD-1, and LAG3 (Crawford et al., Curr Opin Immunol. 2009; 21:179-186; Kaufmann et al., J Immunol 2009; 182:5891-5897, Sharpe et al., Nat Immunol 2007; 8:239-245). PD-1 overexpression by exhausted T cells was observed clinically in patients suffering from chronic viral infections including HIV, HCV and HBV (Crawford et al., Curr Opin Immunol 2009; 21:179-186; Kaufmann et al., J Immunol 2009; 182:5891-5897, Sharpe et al., Nat Immunol 2007; 8:239-245). There has been some investigation into this pathway in additional pathogens, including other viruses, bacteria, and parasites (Hofmeyer et al., J Biomed Biotechnol. Vol 2011, Art. ID 451694, Bhadra et al., Proc Natl Acad Sci. 2011; 108(22):9196-201). For example, the PD-1 pathway was shown to be involved in controlling bacterial infection using a sepsis model induced by the standard cecal ligation and puncture method. The absence of PD-1 in knockout mice protected from sepsis-induced death in this model (Huang et al., PNAS 2009: 106; 6303-6308).

T cell exhaustion can be reversed by blocking co-inhibitory pathways such as PD-1 or CTLA-4 (Rivas et al., J Immunol. 2009; 183:4284-91; Golden-Mason et al., J Virol. 2009; 83:9122-30; Hofmeyer et al., J Biomed Biotechnol. Vol 2011, Art. ID 451694), thus allowing restoration of anti viral immune function. The therapeutic potential of co-inhibition blockade for treating viral infection was extensively studied by blocking the PD-1/PD-L1 pathway, which was shown to be efficacious in several animal models of infection including acute and chronic simian immunodeficiency virus (SIV) infection in rhesus macaques (Valu et al., Nature 2009; 458:206-210) and in mouse models of chronic viral infection, such as lymphocytic choriomeningitis virus (LCMV) (Barber et al., Nature. 2006; 439:682-7), and Theiler's murine encephalomyelitis virus (TMEV) model in SJL/J mice (Duncan and Miller PLoS One. 2011; 6:e18548). In these models PD-1/PD-L1 blockade improved anti viral responses and promoted clearance of the persisting viruses. In addition, PD-1/PD-L1 blockade increased the humoral immunity manifested as elevated production of specific anti-virus antibodies in the plasma, which in combination with the improved cellular responses leads to decrease in plasma viral loads and increased survival.

Blocking negative signaling pathways, such as PD-1 and CTLA-4, can restore the host immune system, enabling it to respond to further stimulation. Combining therapeutic vaccination along with the blockade of inhibitory signals could synergistically enhance functional CD8 T-cell responses and improve viral control in chronically infected individuals, providing a promising strategy for the treatment of chronic viral infections, such as human immunodeficiency virus, hepatitis B virus, and hepatitis C virus (Ha et al, Immunol Rev. 2008 June; 223:317-33). The results of a recent study indicate that blocking of the PD-1 pathway improved T cell responses to HBV vaccination in subjects with HCV infection, and raise the possibility that blocking this pathway might improve success rates of immunization in the setting of chronic viral infection (Moorman et al, Vaccine. 2011 Apr. 12; 29(17):3169-76). Antibodies to PD-1 and CTLA-4 are currently in clinical trials in chronic hepatitis C, as promising candidates for combination with both prophylactic and therapeutic vaccines (Diepolder and Obst, Expert Rev Vaccines. 2010 March; 9(3):243-7). PD-1 blockade also enhances the effectiveness of prophylactic vaccination leading to an increase in epitope specific T cells (Finnefrock et al., J Immunol 2009; 182; 980-987)

In addition to blockade of co-inhibitory pathways for treatment of chronic infections, recent studies using viral infection models have highlighted the importance of positive costimulatory signals during memory responses against viruses. Costimulatory molecules such as CD28, 4-1BB, and OX40 have also been implicated in the survival, generation, maintenance, and quality of virus-specific memory CD8+ T cells. The delivery of costimulatory signals can help boost the generation and function of virus-specific memory CD8+ T cells. The use of costimulatory molecules as adjuvants, along with viral antigens in vaccines, may facilitate the generation of effective antigen-specific memory CD8+ T-cell responses, and may therefore lead to improved vaccines (Duttagupta et al, Crit Rev Immunol. 2009; 29(6):469-86).

A recent study also evaluated the effects of soluble PD-1 (sPD-1) as a blockade of PD-1 and PD-L1 on vaccine-elicited antigen-specific T-cell responses in mice. Coadministration of sPD-1 with a DNA vaccine or with an adenovirus-based vaccine, increased antigen-specific CD8(+) T-cell responses, indicating vaccine type-independent adjuvant effect of sPD-1 (Song et al, J Immunother. 2011 April; 34(3):297-306). These and additional results of this study suggest that an immunization strategy using the soluble extracellular domain (ECD) of a negative costimulatory protein as an adjuvant, could be used to increase antigen-specific T-cell immunity elicited by vaccination.

B cells have also long been considered to have a key role in the development and maintenance of many autoimmune diseases through production of pathogenic autoantibodies, such as systemic lupus erythomatosus (SLE) and Sjogren's disease. However, it is clear that a number of other B cell functions are also critical in the pathogenesis of organ-specific autoimmune diseases that were previously thought to be mainly T cell mediated, such as rheumatoid arthritis (RA) and type 1 diabetes (T1D) (Wong et al 2010, Curr Opin Immunol. 22:723-731).

T cell help to B cells is a pivotal process of adaptive immune responses. Follicular helper T (Tfh) cells are a subset of CD4+ T cells specialized in B cell help (reviewed by Crotty, Annu. Rev. Immunol. 29: 621-663, 2011). Tfh cells express the B cell homing chemokine receptor, CXCR5, which drives Tfh cell migration into B cell follicles within lymph nodes in a CXCL13-dependent manner. Tfh cells first interact with cognate B cells at the T cell-B cell border and subsequently induce germinal center B cell differentiation and germinal center formation within the follicle (Reviewed by Crotty, Annu. Rev. Immunol. 29: 621-663, 2011). The requirement of Tfh cells for B cell help and T cell-dependent antibody responses indicates that this cell type is of great importance for protective immunity against various types of infectious agents, as well as for rational vaccine design. Not surprisingly, dysregulation and aberrant accumulation of Tfh cells has also been linked with autoimmune diseases, such as Sjogren's disease and autoimmune arthritis (Yu and Vinuesa, 2010, Cell. Mol. Immunol. 7: 198-203).

Tfh cells selectively express a wealth of surface proteins, which are involved in their selective localization (such as CXCR5) and in direct physical interactions with B cells to provide B cell help. Among the latter group are several members of the costimulatory proteins family which are highly expressed in Tfh cells, including the inducible co-stimulatory receptor ICOS, and the negative costimulators (inhibitory receptors) PD-1 and BTLA (Crotty, Annu. Rev. Immunol. 29: 621-663, 2011), thus this cell subset may be also controlled by modulation of costimulatory and coinhibitory pathways, contributing to the effect on B cell function.

Regulating costimulation using agonists and/or antagonists to various costimulatory proteins has been extensively studied as a strategy for treating autoimmune diseases, graft rejection, allergy and cancer. This field has been clinically pioneered by CTLA4-Ig (Abatacept, Orencia®) which is approved for treatment of RA, mutated CTLA4-Ig (Belatacept, Nulojix®) for prevention of acute kidney transplant rejection and by the anti-CTLA4 antibody (Ipilimumab, Yervoy®), recently approved for the treatment of melanoma. Other costimulation regulators are currently in advanced stages of clinical development including anti-PD-1 antibody (MDX-1106) which is in development for treatment of advanced/metastatic clear-cell renal cell carcinoma (RCC) and anti-CD40L Antibody (BG9588, Antova®) for treatment of renal allograft transplantation. Furthermore, such agents are also in clinical development for viral infections, for example the anti PD-1 Ab, MDX-1106, which is being tested for treatment of hepatitis C, and the anti-CTLA-4 Ab CP-675,206 (tremelimumab) which is in a clinical trial in hepatitis C virus-infected patients with hepatocellular carcinoma; the goals of the study are to test its effect on the carcinoma and on the replication of the virus.

BRIEF SUMMARY OF THE INVENTION

According to at least some embodiments, the invention provides novel therapeutic and diagnostic compositions containing an ectodomain or soluble or secreted form of the LY6G6F, VSIG10, TMEM25 and/or LSR proteins and/or variants and/or orthologs and/or fragments, and/or conjugate containing same, and/or nucleic acid sequences encoding for same.

The full length amino acid sequence of the known (wild type) LY6G6F protein (lymphocyte antigen 6 complex locus protein G6f, genbank accession number: NP_001003693, SEQ ID NO:1) is shown in FIG. 1A. The full length amino acid sequence of known (wild type) VSIG10 protein (V-set and immunoglobulin domain-containing protein 10, genbank accession number: NP_061959, SEQ ID NO:3), and the amino acid sequence of VSIG10 novel variant (SEQ ID NO:5) are shown in FIGS. 1B and 1C, respectively. The amino acid sequence alignment of VSIG10 novel variant (SEQ ID NO:5) and the known (wild type) VSIG10 protein (SEQ ID NO:3) is shown in FIG. 2A. The full length amino acid sequence of known (wild type) TMEM25 protein (Transmembrane protein 25, Swiss-Prot accession number: Q86YD3, SEQ ID NO:7) is shown in FIG. 1D. The full length amino acid sequence of known (wild type) LSR protein (lipolysis-stimulated lipoprotein receptor isoform 2, genbank accession number: NP_991403) is provided in SEQ ID NO:62. The amino acid sequences of LSR variants SEQ ID NOs:11, 13, 15, 16, 17 and 18 are shown in FIGS. 1E, 1F, 1G, 1H, 1I, and 1J, respectively. The amino acid sequence alignment of the LSR variants SEQ ID NOs: 11, 13, 15, 16, 17 and 18 with previously known LSR sequences (SEQ ID NOs: 62-67) is demonstrated in FIGS. 2B, 2C, 2D, 2E, 2F, 2G, respectively.

According to at least some embodiments, there is provided an isolated polypeptide comprising at least 98 amino acids of the soluble ectodomain of a sequence selected from the group consisting of SEQ ID NOs:11, 13, 15-18, 67, and 143; at least 62 amino acids of the soluble ectodomain of a sequence selected from the group consisting of SEQ ID NOs:1 and 58; at least 36 amino acids of the soluble ectodomain of a sequence selected from the group consisting of SEQ ID NOs:3 and 5; or at least 46 amino acids of the soluble ectodomain of SEQ ID NO:7, or an isolated polypeptide consisting essentially of an amino acid sequence as set forth in SEQ ID NO:5 or variant thereof that possesses at least 95% sequence identity therewith; or variants, or orthologs, or fragments thereof.

Optionally the isolated polypeptide comprises only between 98 to 180 amino acids of the sequence selected from the group consisting of SEQ ID NOs:11, 13, 15-18, 67, and 143; between 62 to 228 amino acids of the sequence selected from the group consisting of SEQ ID NOs:1 and 58; between 36 and 393 of the sequence selected from the group consisting of SEQ ID NOs:3 and 5; or between 46 and 216 amino acids of SEQ ID NO:7.

Also optionally, the isolated polypeptide is selected from the group consisting of a polypeptide comprising only between 98 to 118, 135 to 155, and 160 to 180 amino acids of the sequence selected from the group consisting of SEQ ID NOs:11, 13, 15-18, 67, and 143; between 62 to 82, 95 to 115, 208 to 228 amino acids of the sequence selected from the group consisting of SEQ ID NOs:1 and 58; between 36 to 70, 80 to 100, 170 to 200, 265 to 290, 365 to 393 amino acids of the sequence selected from the group consisting of SEQ ID NOs:3 and 5; or between 46 to 66, 84 to 104, 196 to 216 amino acids of SEQ ID NO:7.

Also optionally, the isolated polypeptide comprises only about 72, 106, or 218 amino acids of the sequence selected from the group consisting of SEQ ID NOs:1 and 58; about 108, 145, or 170 amino acids of the sequence selected from the group consisting of SEQ ID NOs:11, 13, 15-18, 67, and 143; about 56, 94, or 206 amino acids of SEQ ID NO:7; or about 46, 49, 58, 60, 87, 89, 93, 94, 178, 182, 185, 187, 273, 279, 282, 374 or 383 amino acids of SEQ ID NOs:3 and 5.

Also optionally, the isolated polypeptide consists essentially of an amino acid sequence having at least 95% sequence identity with amino acid sequences set forth in any one of SEQ ID NOs: 12, 2, 4-6, 8, 14, 47-50, 10, 15-18, 22, 39, 59-61; 81-102. Optionally and preferably, the isolated polypeptide consists essentially of the amino acid sequence set forth in any one of SEQ ID NOs: 12, 2, 4-6, 8, 14, 47-50, 10, 15-18, 22, 39, 59-61; 81-102.

Optionally, the isolated polypeptide blocks or inhibits the interaction of LSR, TMEM25, VSIG10, LY6G6F, or a fragment or variant thereof with a corresponding functional counterpart.

Optionally, the isolated polypeptide replaces or augments the interaction of LSR, TMEM25, VSIG10, LY6G6F, or a fragment or variant thereof with a corresponding functional counterpart.

Optionally, the isolated ortholog is a mouse polypeptide selected from SEQ ID NOs: 9 and 19-21.

According to at least some embodiments, the present invention provides isolated polypeptides comprising discrete portions (fragments) of VSIG10 proteins, corresponding to:

A. An isolated chimeric polypeptide, comprising a first amino acid sequence being at least 95% homologous to MAAGGSAPEPRVLVCLGALLAGWVAVGLEAVVIGEVHENVTLHCGNISGLRGQ VTWYRNNSEPVFLLSSNSSLRPAEPRFSLVDATSLHIESLSLGDEGIYTCQEILNVT QWFQVWLQVA corresponding to amino acids 1-120 of known VSIG10 protein (SEQ ID NO:3), which also corresponds to amino acids 1-120 of VSIG10 variant (SEQ ID NO:5), a second bridging amino acid sequence comprising of N, and a third amino acid sequence being at least 95% homologous to PPPSAPQCWAQMASGSFMLQLTCRWDGGYPDPDFLWIEEPGGVIVGKSKLGVE MLSESQLSDGKKFKCVTSHIVGPESGASCMVQIRGPSLLSEPMKTCFTGGNVTLT CQVSGAYPPAKILWLRNLTQPEVIIQPSSRHLITQDGQNSTLTIHNCSQDLDEGYYI CRADSPVGVREMEIWLSVKEPLNIGGIVGTIVSLLLLGLAIISGLLLHYSPVFCWK VGNTSRGQNMDDVMVLVDSEEEEEEEEEEEEDAAVGEQEGAREREELPKEIPKQ DHIHRVTALVNGNIEQMGNGFQDLQDDSSEEQSDIVQEEDRPV corresponding to amino acids 223-540 of known VSIG10 protein (SEQ ID NO:3), which also corresponds to amino acids 122-439 of VSIG10 variant (SEQ ID NO:5), wherein said first amino acid sequence, second bridging amino acid sequence and third amino acid sequence are contiguous and in a sequential order.

B. An isolated polypeptide of an edge portion of VSIG10 variant (SEQ ID NO:5), comprising a polypeptide having a length “n”, wherein n is at least about 10 amino acids in length, optionally at least about 20 amino acids in length, preferably at least about 30 amino acids in length, more preferably at least about 40 amino acids in length and most preferably at least about 50 amino acids in length, wherein at least 3 amino acids comprise ANP having a structure as follows (numbering according to VSIG10 variant (SEQ ID NO:5)): a sequence starting from any of amino acid numbers 120−x to 120; and ending at any of amino acid numbers 122+((n−3)−x), in which x varies from 0 to n−3.

According to at least some embodiments, the subject invention further provides isolated polypeptides comprising a sequence of amino acid residues corresponding to discrete portions of VSIG10 proteins, corresponding to the new junction and edge portions of VSIG10 variant (SEQ ID NO: 5). The unique sequence of the new junction of VSIG10 variant (SEQ ID NO: 5) is demonstrated in protein sequence alignment in FIG. 2A.

According to at least some embodiments, the subject invention provides isolated polypeptides comprising discrete portions (fragments) of LSR proteins, corresponding to:

A. An isolated chimeric polypeptide, comprising a first amino acid sequence being at least 95% homologous to MALLAGGLSRGLGSHPAAAGRDAVVFVWLLLSTWCTAPARAIQVTVSNPYHVV ILFQPVTLPCTYQMTSTPTQPIVIWKYKSFCRDRIADAFSPASVDNQLNAQLAAGN PGYNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRRITITGNADLTFDQTAW GDSGVYYCSVVSAQDLQGNNEAYAELIVLGRTSGVAELLPGFQAGPIE corresponding to amino acids 49-258 of known LSR protein (SEQ ID NO:62), which also corresponds to amino acids 1-210 of LSR variant isoform f (SEQ ID NO:18), a second bridging amino acid sequence comprising of V, and a third amino acid sequence being at least 95% homologous to YAAGKAATSGVPSIYAPSTYAHLSPAKTPPPPAMIPMGPAYNGYPGGYPGDVDRS SSAGGQGSYVPLLRDTDSSVASEVRSGYRIQASQQDDSMRVLYYMEKELANFDP SRPGPPSGRVERAMSEVTSLHEDDWRSRPSRGPALTPIRDEEWGGHSPRSPRGWD QEPAREQAGGGWRARRPRARSVDALDDLTPPSTAESGSRSPTSNGGRSRAYMPP RSRSRDDLYDQDDSRDFPRSRDPHYDDFRSRERPPADPRSHHHRTRDPRDNGSRS GDLPYDGRLLEEAVRKKGSEERRRPHKEEEEEAYYPPAPPPYSETDSQASRERRL KKNLALSRESLVV corresponding to amino acids 309-649 of known LSR protein (SEQ ID NO:62), which also corresponds to amino acids 212-552 of LSR variant isoform f (SEQ ID NO:18), wherein said first amino acid sequence, second bridging amino acid and third amino acid sequence are contiguous and in a sequential order.

B. An isolated polypeptide of an edge portion of LSR variant isoform f (SEQ ID NO:18), comprising a polypeptide having a length “n”, wherein n is at least about 10 amino acids in length, optionally at least about 20 amino acids in length, preferably at least about 30 amino acids in length, more preferably at least about 40 amino acids in length and most preferably at least about 50 amino acids in length, wherein at least 3 amino acids comprise EVY having a structure as follows (numbering according to SEQ ID NO:18): a sequence starting from any of amino acid numbers 210−x to 210; and ending at any of amino acid numbers 212+((n−3)−x), in which x varies from 0 to n−3.

C. An isolated chimeric polypeptide comprising a first amino acid sequence being at least 95% homologous to MALLAGGLSRGLGSHPAAAGRDAVVFVWLLLSTWCTAPARAIQVTVSNPYHVV ILFQPVTLPCTYQMTSTPTQPIVIWKYKSFCRDRIADAFSPASVDNQLNAQLAAGN PGYNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRRITITGNADLTFDQTAW GDSGVYYCSVVSAQDLQGNNEAYAELIVL corresponding to amino acids 49-239 of known LSR protein (SEQ ID NO:66), which also corresponds to amino acids 1-191 of LSR variant isoform f (SEQ ID NO:18), a second amino acid sequence being at least 80%, preferably at least 85%, more preferably at least 90% and most preferably at least 95% homologous to a polypeptide having the sequence GRTSGVAELLPGFQAGPIE corresponding to amino acids 192-218 of LSR variant isoform f (SEQ ID NO:18), and a third amino acid sequence being at least 95% homologous to VYAAGKAATSGVPSIYAPSTYAHLSPAKTPPPPAMIPMGPAYNGYPGGYPGDVD RSSSAGGQGSYVPLLRDTDSSVASEVRSGYRIQASQQDDSMRVLYYMEKELANF DPSRPGPPSGRVERAMSEVTSLHEDDWRSRPSRGPALTPIRDEEWGGHSPRSPRG WDQEPAREQAGGGWRARRPRARSVDALDDLTPPSTAESGSRSPTSNGGRSRAY MPPRSRSRDDLYDQDDSRDFPRSRDPHYDDFRSRERPPADPRSHHHRTRDPRDN GSRSGDLPYDGRLLEEAVRKKGSEERRRPHKEEEEEAYYPPAPPPYSETDSQASR ERRLKKNLALSRESLVV corresponding to amino acids 240-581 of known LSR protein SEQ ID NO:66, which also corresponds to amino acids 211-552 of LSR variant isoform f (SEQ ID NO:18), wherein said first amino acid sequence, second amino acid sequence and third amino acid sequence are contiguous and in a sequential order.

D. An isolated polypeptide of an edge portion of LSR variant isoform f (SEQ ID NO:18), comprising an amino acid sequence being at least about 80%, preferably at least about 85%, more preferably at least about 90% and most preferably at least about 95% homologous to the sequence GRTSGVAELLPGFQAGPIE of LSR variant isoform f (SEQ ID NO:18).

According to at least some embodiments, the subject invention further provides isolated polypeptides comprising a sequence of amino acid residues corresponding to discrete portions of LSR, corresponding to the new junction and edge portions of LSR variant LSR isoform-f (SEQ ID NO: 18). The unique sequences of the new junction of the LSR isoform-f (SEQ ID NO: 18) is demonstrated in protein sequence alignment in FIG. 2G.

According to at least some embodiments, the subject invention provides polypeptides comprising a sequence of amino acid residues corresponding to discrete portions of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, including different portions of the extracellular domain corresponding to residues 17-234 of LY6G6F (SEQ ID NO:1), corresponding to amino acid sequence depicted in SEQ ID NO:2; residues 31-413 of VSIG10 (SEQ ID NO:3), corresponding to amino acid sequence depicted in SEQ ID NO:4; residues 31-312 of VSIG10 (SEQ ID NO:5), corresponding to amino acid sequence depicted in SEQ ID NO:6; residues 27-232 of TMEM25 (SEQ ID NO:7), corresponding to amino acid sequence depicted in SEQ ID NO:8; residues 42-211 of LSR (SEQ ID NO:11, and/or SEQ ID NO:143), corresponding to amino acid sequence depicted in SEQ ID NO:12; residues 42-192 of LSR (SEQ ID NO:13), corresponding to amino acid sequence depicted in SEQ ID NO:14, residues 42-533 of LSR (SEQ ID NO:15), corresponding to amino acid sequence depicted in SEQ ID NO:47, residues 42-532 of LSR (SEQ ID NO:16), corresponding to amino acid sequence depicted in SEQ ID NO:48, residues 42-493 of LSR (SEQ ID NO:17), corresponding to amino acid sequence depicted in SEQ ID NO:49, residues 42-552 of LSR (SEQ ID NO:18), corresponding to amino acid sequence depicted in SEQ ID NO:50, and/or fragments and/or variants thereof possessing at least 85%, 90%, 95, 96, 97, 98 or 99% sequence homology therewith. According to still further embodiments, the LY6G6F ECD fragments are selected from any one of SEQ ID NOs 81, 96, and variants thereof, as described herein. According to still further embodiments, the VSIG10 ECD fragments are selected from any one of SEQ ID NOs 82-93, 97-100, and variants thereof, as described herein. According to still further embodiments, the LSR ECD fragments are selected from any one of SEQ ID NOs 95, 102, and variants thereof, as described herein. According to still further embodiments, the TMEM25 ECD fragments are selected from any one of SEQ ID NOs 94, 101, and variants thereof, as described herein. According to still further embodiments, the discrete portions of LY6G6F, VSIG10, TMEM25 and/or LSR proteins may or may not include a signal (leader) peptide (SP) sequence (FIG. 1). According to at least some embodiments of the invention, there are provided examples of the ECD portions including SP sequences of LY6G6F, VSIG10, TMEM25 and/or LSR proteins. An example of ECD portion including SP sequence of LY6G6F protein (SEQ ID NO:1) is amino acid sequence set forth in SEQ ID NO:59. An example of ECD portion including SP sequence of VSIG10 protein (SEQ ID NO:3) is amino acid sequence set forth in SEQ ID NO:60. An example of ECD portion including SP sequence of VSIG10 protein (SEQ ID NO:5) is amino acid sequence set forth in SEQ ID NO:61. An example of ECD portion including SP sequence of TMEM25 protein (SEQ ID NO:7) is amino acid sequence set forth in SEQ ID NO: 39. An example of ECD portion including SP sequence of LSR protein (SEQ ID NO:11) is amino acid sequence set forth in SEQ ID NO:10. An example of ECD portion including SP sequence of LSR protein (SEQ ID NO:14) is amino acid sequence set forth in SEQ ID NO:22.

According to further embodiments, the invention provides polypeptides comprising a sequence of amino acid residues corresponding to soluble LSR proteins depicted in SEQ ID NO: 18, including different portions thereof or variants thereof possessing at least 85%, 90%, 95, 96, 97, 98 or 99% sequence homology therewith. According to further embodiments, the invention provides polypeptides comprising a sequence of amino acid residues corresponding to soluble LSR proteins depicted in any one of SEQ ID NOs:15-16, including different portions thereof or variants thereof possessing at least 95, 96, 97, 98 or 99% sequence homology therewith. According to further embodiments, the invention provides polypeptides comprising a sequence of amino acid residues corresponding to soluble LSR proteins depicted in any one of SEQ ID NOs:15-18. According to still further embodiments, the soluble LSR proteins depicted in any one of SEQ ID NOs:15-18 may or may not include a signal (leader) peptide sequence (FIGS. 1G, G, I and J).

According to still further embodiments, the invention provides polypeptides comprising a sequence of amino acid residues corresponding to extracellular domains of orthologs of TMEM25, LY6G6F, VSIG10, LSR variant 1 and/or LSR variant 2 proteins, particularly mouse orthologs (SEQ ID NOs: 28, 29, 30, 31 and/or 32, respectively), including but not limited to mouse orthologs extracellular domains corresponding to amino acid sequence depicted in SEQ ID NOs: 9, 19-21, or portions or variants thereof possessing at least 85%, 90%, 95, 96, 97, 98 or 99% sequence homology therewith.

According to still further embodiments, the invention provides polypeptides comprising an amino acid sequence corresponding to any one of novel variants of VSIG10 (SEQ ID NO: 5), and LSR (SEQ ID NOs: 11, 13, 15, 16 and 18).

According to at least some embodiments, the present invention provides a fusion protein comprising any of the above polypeptides joined to a heterologous sequence. Optionally, the heterologous sequence comprises at least a portion of an immunoglobulin molecule. Optionally and preferably, the immunoglobulin molecule portion is an immunoglobulin heavy chain constant region Fc fragment. Optionally and more preferably, the immunoglobulin heavy chain constant region is derived from an immunoglobulin isotype selected from the group consisting of an IgG1, IgG2, IgG3, IgG4, IgM, IgE, IgA and IgD. Optionally and most preferably, the fusion protein has the amino acid sequence set forth in any one of SEQ ID NOs: 71-80, 172-181 or set forth in any one of SEQ ID NOs:23-26 and also optionally modulates immune cell response in vitro or in vivo.

According to at least some embodiments, the subject invention provides isolated nucleic acid sequences encoding any one of the foregoing novel variants of TMEM25, VSIG10, and/or LSR and/or any one of the foregoing LY6G6F, VSIG10, TMEM25 and/or LSR extracellular domain polypeptides or fragments or homologs or orthologs thereof.

According to at least some embodiments, there is provided an isolated nucleic acid sequence selected from the group consisting of SEQ ID NOs: 33-37, 40-46, 132, 155, 182-198, or variant thereof that possesses at least 95% sequence identity therewith, or a degenerative variant thereof.

According to at least some embodiments, the subject invention provides an isolated polynucleotide encoding a polypeptide comprising any one of the amino acid sequences, as set forth in SEQ ID NOs: 2, 4, 5, 6, 8-16, 18-22, 39, 47-50, 59-61, 143, or a fragment or variant thereof that possesses at least 85, 90, 95, 96, 97, 98 or 99% sequence identity therewith, or a degenerative variant thereof.

According to at least some embodiments, the subject invention provides an isolated polynucleotide comprising a nucleic acid as set forth in any one of SEQ ID NO:33-37, 40-46, 132, 145, 155, 182-188, or a sequence homologous thereto or degenerative variants thereof. According to another embodiment, the isolated polynucleotide is at least 85, 90, 95, 96, 97, 98 or 99% homologous to a nucleic acid sequence as set forth in any one of SEQ ID NOs: 33-37, 40-46, 145.

According to at least some embodiments, there is provided an expression vector or a virus, containing at least one isolated nucleic acid sequence as described herein. According to at least some embodiments, there is provided a recombinant cell comprising an expression vector or a virus containing an isolated nucleic acid sequence as described herein, wherein the cell constitutively or inducibly expresses the polypeptide encoded by the DNA segment. According to at least some embodiments, there is provided a method of producing a LSR, TMEM25, VSIG10, LY6G6F soluble ectodomain polypeptide, or fragment or fusion protein thereof, comprising culturing the recombinant cell as described herein, under conditions whereby the cell expresses the polypeptide encoded by the DNA segment or nucleic acid and recovering said polypeptide.

According to at least some embodiments of the present invention, there is provided a pharmaceutical composition comprising an isolated amino acid sequence of ectodomain or soluble or secreted forms of any one of LY6G6F, VSIG10, TMEM25, LSR proteins or variants or orthologs or fragments or conjugates containing same.

According to at least some embodiments, the invention provides an isolated or purified amino acid sequence of soluble and/or extracellular domain of LY6G6F, VSIG10, TMEM25 and/or LSR protein or nucleic acid sequence encoding same, which optionally may be directly or indirectly attached to a non-LY6G6F, VSIG10, TMEM25 and/or LSR protein or nucleic acid sequence, such as a soluble immunoglobulin domain or fragment.

According to at least some embodiments, the invention provides vectors such as plasmids and recombinant viral vectors and host cells containing that express secreted or soluble form and/or the ECD of the LY6G6F, VSIG10, TMEM25 and/or LSR protein or fragments or variants or orthologs thereof or polypeptide conjugates containing any of the foregoing.

According to at least some embodiments the invention provides a use of these vectors such as plasmids and recombinant viral vectors and host cells containing that express any one of LY6G6F, VSIG10, TMEM25 and/or LSR, secreted and/or soluble form and/or the ECD and/or fragments thereof and/or variants, and/or orthologs thereof and/or polypeptide conjugates containing any of the foregoing to produce any one of said LY6G6F, VSIG10, TMEM25 and/or LSR proteins.

According to at least some embodiments, the invention provides pharmaceutical or diagnostic compositions containing any of the foregoing.

According to at least some embodiments, the invention provides a use of any one of the compounds containing at least one of LY6G6F, VSIG10, TMEM25 and/or LSR ectodomains, soluble or secreted form or fragments or orthologs or variants thereof, or conjugates, or nucleic acid sequence encoding same, or pharmaceutical composition comprising same, as therapeutics for treatment or prevention of cancer as recited herein, infectious disorder as recited herein, and/or immune related disorder, including but not limited to autoimmune diseases as recited herein, transplant rejection and graft versus host disease and/or for blocking or promoting immune costimulation mediated by any one of the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, immune related diseases as recited herein and/or for immunotherapy (promoting or inhibiting immune costimulation). According to at least some embodiments, the autoimmune disease includes any autoimmune disease, and optionally and preferably includes but is not limited to any of the types and subtypes of any of multiple sclerosis, rheumatoid arthritis, type I diabetes, psoriasis, systemic lupus erythematosus, inflammatory bowel disease, uveitis, or Sjogren's syndrome.

According to at least some embodiments, the invention provides a use of any one of the compounds containing at least one of LY6G6F, VSIG10, TMEM25 and/or LSR ectodomains, soluble or secreted form or fragments or orthologs or variants thereof, or conjugates, or nucleic acid sequence encoding same, or pharmaceutical composition comprising same, for administration as an anti-cancer vaccine, as an adjuvant for anti cancer vaccine, and/or for adoptive immunotherapy, and/or for immunotherapy of cancer as recited herein.

According to at least some embodiments, the invention provides a use of any of the LY6G6F, VSIG10, TMEM25 and/or LSR proteins, and/or nucleic acid sequences as targets for development of drugs which specifically bind to any one of the LY6G6F, VSIG10, TMEM25 and/or LSR proteins and/or drugs which agonize or antagonize the binding of other moieties to the LY6G6F, VSIG10, TMEM25 and/or LSR proteins.

According to at least some embodiments, the present invention provides drugs which modulate (agonize or antagonize) at least one of the LY6G6F, VSIG10, TMEM25 and/or LSR related biological activity. Such drugs include by way of example antibodies, small molecules, peptides, ribozymes, aptamers, antisense molecules, siRNA's and the like. These molecules may directly bind or modulate an activity elicited by the any one of the LY6G6F, VSIG10, TMEM25 and/or LSR proteins or the LY6G6F, VSIG10, TMEM25 and/or LSR DNA or portions or variants thereof or may indirectly modulate any one of the LY6G6F, VSIG10, TMEM25 and/or LSR associated activity or binding of molecules to any one of the LY6G6F, VSIG10, TMEM25 and/or LSR and portions and variants thereof such as by modulating the binding of any one of LY6G6F, VSIG10, TMEM25 and/or LSR to its counterreceptor or endogenous ligand.

According to at least some embodiments, the invention provides novel monoclonal or polyclonal antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, that specifically bind any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins as described herein or polypeptides having at least 95% homology thereto. Optionally such antibodies bind to proteins selected from the group consisting of any one of SEQ ID NOs: 1-8, 10-18, 22, 39, 47-50, 59-61, 9, 19-21, and/or the amino acid sequences corresponding to the unique edges of any one of SEQ ID NOs: 5 and 18, particularly wherein these antibodies, antigen binding fragments and conjugates containing same, and/or alternative scaffolds, are adapted to be used as therapeutic and/or diagnostic agents (both in vitro and in vivo diagnostic methods), particularly for treatment and/or diagnosis of infectious disorder as recited herein, and/or immune related disorder, including but not limited to autoimmune diseases as recited herein, immune related diseases as recited herein, transplant rejection and graft versus host disease, as well as cancers and malignancies as recited herein.

According to at least some embodiments, there are provided antibodies in which the antigen binding site comprises a conformational or linear epitope, and wherein the antigen binding site contains about 3-7 contiguous or non-contiguous amino acids. Optionally, the antibody is a fully human antibody, chimeric antibody, humanized or primatized antibody.

Also optionally, the antibody is selected from the group consisting of Fab, Fab′, F(ab′)2, F(ab′), F(ab), Fv or scFv fragment and minimal recognition unit.

Also optionally, the antibody is coupled to a moiety selected from a drug, a radionuclide, a fluorophore, an enzyme, a toxin, a therapeutic agent, or a chemotherapeutic agent; and wherein the detectable marker is a radioisotope, a metal chelator, an enzyme, a fluorescent compound, a bioluminescent compound or a chemiluminescent compound.

Also optionally the antibody blocks or inhibits the interaction of any one of LSR, TMEM25, VSIG10, LY6G6F polypeptides, or a fragment or variant thereof with a counterpart.

Also optionally the antibody replaces or augments the interaction of LSR, TMEM25, VSIG10, LY6G6F polypeptides, or a fragment or variant thereof with a counterpart.

Also optionally the antibody elicits apoptosis or lysis of cancer cells that express any one of LSR, TMEM25, VSIG10, LY6G6F protein.

Also optionally the apoptosis or lysis involves CDC or ADCC activity of the antibody, wherein CDC (complement dependent cytotoxicity) or ADCC (antibody dependent cellular cytotoxicity) activities are used to target the immune cells.

According to at least some embodiments, the invention provides antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the LY6G6F protein including different portions of the extracellular domain corresponding to residues 17-234 of LY6G6F (SEQ ID NO:1), set forth in SEQ ID NO: 2, and/or corresponding to amino acid sequences set forth in any one of SEQ ID NOs: 81, 96. According to further embodiments the invention provides antibodies antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the mouse LY6G6F protein (SEQ ID NO: 29), including different portions of the extracellular domain corresponding to SEQ ID NO:20.

According to at least some embodiments, the invention provides antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the VSIG10 protein including different portions of the extracellular domain corresponding to amino acid residues 31-413 of VSIG10 (SEQ ID NO:3), depicted in SEQ ID NO:4; amino acid residues 31-312 of VSIG10 (SEQ ID NO:5), depicted in SEQ ID NO:6, and/or corresponding to amino acid sequences set forth in any one of SEQ ID NOs:82-93, 97-100. According to further embodiments the invention provides antibodies antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the mouse VSIG10 protein (SEQ ID NO: 30), including different portions of the extracellular domain corresponding to SEQ ID NO:19. According to at least some embodiments, the invention provides antibodies, antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the VSIG10 protein including the edge portion of VSIG10 variant (SEQ ID NO:5), as described herein.

According to at least some embodiments, the invention provides antibodies, antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the TMEM25 proteins including different portions of the extracellular domain corresponding to amino acid residues 27-232 of TMEM25 (SEQ ID NO:7), depicted in SEQ ID NO:8, and/or corresponding to amino acid sequences set forth in any one of SEQ ID NOs: 94, 101. According to further embodiments the invention provides antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the mouse TMEM25 protein (SEQ ID NO: 28), including different portions of the extracellular domain, set forth in SEQ ID NO:9.

According to at least some embodiments, the invention provides antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the LSR proteins including different portions of the extracellular domain corresponding to amino acid residues 42-211 of LSR (SEQ ID NO:11), depicted in SEQ ID NO:12; amino acid residues 42-192 of LSR (SEQ ID NO:13), depicted in SEQ ID NO:14, amino acid residues 42-533 of LSR (SEQ ID NO:15), depicted in SEQ ID NO:47, amino acid residues 42-532 of LSR (SEQ ID NO:16), depicted in SEQ ID NO:48, amino acid residues 42-493 of LSR (SEQ ID NO:17), depicted in SEQ ID NO:49, amino acid residues 42-552 of LSR (SEQ ID NO:18), depicted in SEQ ID NO:50, and/or corresponding to amino acid sequences set forth in any one of SEQ ID NOs:95, 102. According to further embodiments the invention provides antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the mouse LY6G6F proteins (SEQ ID NOs: 31-32), including different portions of the extracellular domain corresponding to SEQ ID NO:21.

According to at least some embodiments, the invention provides antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the LSR proteins including the unique edge portion of LSR variant isoform-f (SEQ ID NO:18), as described herein.

According to at least some embodiments, the invention provides antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against discrete portions of the soluble LSR proteins including different portions of the LSR proteins depicted in any one of SEQ ID NOs:15-18, 47-50.

According to at least some embodiments the invention relates to protein scaffolds with specificities and affinities in a range similar to specific antibodies. According to at least some embodiments the present invention relates to an antigen-binding construct comprising a protein scaffold which is linked to one or more epitope-binding domains. Such engineered protein scaffolds are usually obtained by designing a random library with mutagenesis focused at a loop region or at an otherwise permissible surface area and by selection of variants against a given target via phage display or related techniques. According to at least some embodiments the invention relates to alternative scaffolds including, but not limited to, anticalins, DARPins, Armadillo repeat proteins, protein A, lipocalins, fibronectin domain, ankyrin consensus repeat domain, thioredoxin, chemically constrained peptides and the like. According to at least some embodiments the invention relates to alternative scaffolds that are used as therapeutic agents for treatment of cancer as recited herein, immune related diseases as recited herein, autoimmune disease as recited herein and infectious diseases, as well as for in vivo diagnostics.

According to at least some embodiments of the present invention, there is provided a pharmaceutical composition comprising an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein, and further comprising a pharmaceutically acceptable diluent or carrier.

According to at least some embodiments, there is provided use of any of any one of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition as described herein, wherein administration of such to the subject inhibits or reduces activation of T cells.

According to at least some embodiments, there is provided use of any of any one of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition as described herein, for treatment of cancer.

According to at least some embodiments, there is provided use of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition as described herein, for treatment of infectious disorder.

According to at least some embodiments, there is provided a method of performing one or more of the following in a subject:

a. upregulating cytokines;

b. inducing expansion of T cells;

c. promoting antigenic specific T cell immunity;

d. promoting CD4+ and/or CD8+ T cell activation;

comprising administering any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition as described hereinto the subject.

According to at least some embodiments, there is provided a method for treating or preventing immune system related condition comprising administering to a subject in need thereof an effective amount of any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition.

Optionally, the immune system related condition comprises an immune related condition, autoimmune diseases as recited herein, transplant rejection and graft versus host disease and/or for blocking or promoting immune costimulation mediated by any one of the LSR, TMEM25, VSIG10, and/or LY6G6F polypeptides, immune related diseases as recited herein and/or for immunotherapy (promoting or inhibiting immune costimulation).

Optionally the treatment is combined with another moiety useful for treating immune related condition.

Optionally the moiety is selected from the group consisting of immunosuppressants such as corticosteroids, cyclosporin, cyclophosphamide, prednisone, azathioprine, methotrexate, rapamycin, tacrolimus, biological agents such as TNF-alpha blockers or antagonists, or any other biological agent targeting any inflammatory cytokine, nonsteroidal antiinflammatory drugs/Cox-2 inhibitors, hydroxychloroquine, sulphasalazopryine, gold salts, etanercept, infliximab, mycophenolate mofetil, basiliximab, atacicept, rituximab, cytoxan, interferon beta-1a, interferon beta-1b, glatiramer acetate, mitoxantrone hydrochloride, anakinra and/or other biologics and/or intravenous immunoglobulin (IVIG), interferons such as IFN-beta-1a (REBIF®. and AVONEX®) and IFN-beta-1b (BETASERON®); glatiramer acetate (COPAXONE®), a polypeptide; natalizumab (TYSABRI®), mitoxantrone (NOVANTRONE®), a cytotoxic agent, a calcineurin inhibitor, e.g. cyclosporin A or FK506; an immunosuppressive macrolide, e.g. rapamycine or a derivative thereof; e.g. 40-O-(2-hydroxy)ethyl-rapamycin, a lymphocyte homing agent, e.g. FTY720 or an analog thereof, corticosteroids; cyclophosphamide; azathioprene; methotrexate; leflunomide or an analog thereof; mizoribine; mycophenolic acid; mycophenolate mofetil; 15-deoxyspergualine or an analog thereof; immunosuppressive monoclonal antibodies, e.g., monoclonal antibodies to leukocyte receptors, e.g., MHC, CD2, CD3, CD4, CD11a/CD18, CD7, CD25, CD 27, B7, CD40, CD45, CD58, CD 137, ICOS, CD150 (SLAM), OX40, 4-1BB or their ligands; or other immunomodulatory compounds, e.g. CTLA4-Ig (abatacept, ORENCIA®), CD28-Ig, B7-H4-Ig, or other costimulatory agents, or adhesion molecule inhibitors, e.g. mAbs or low molecular weight inhibitors including LFA-1 antagonists, Selectin antagonists and VLA-4 antagonists, or another immunomodulatory agent.

Optionally the immune condition is selected from autoimmune disease, transplant rejection, or graft versus host disease.

Optionally the autoimmune disease is selected from a group consisting of multiple sclerosis, including relapsing-remitting multiple sclerosis, primary progressive multiple sclerosis, and secondary progressive multiple sclerosis; psoriasis; rheumatoid arthritis; psoriatic arthritis, systemic lupus erythematosus (SLE); ulcerative colitis; Crohn's disease; benign lymphocytic angiitis, thrombocytopenic purpura, idiopathic thrombocytopenia, idiopathic autoimmune hemolytic anemia, pure red cell aplasia, Sjogren's syndrome, rheumatic disease, connective tissue disease, inflammatory rheumatism, degenerative rheumatism, extra-articular rheumatism, juvenile rheumatoid arthritis, arthritis uratica, muscular rheumatism, chronic polyarthritis, cryoglobulinemic vasculitis, ANCA-associated vasculitis, antiphospholipid syndrome, myasthenia gravis, autoimmune haemolytic anaemia, Guillian-Barre syndrome, chronic immune polyneuropathy, autoimmune thyroiditis, insulin dependent diabetes mellitus, type I diabetes, Addison's disease, membranous glomerulonephropathy, Goodpasture's disease, autoimmune gastritis, autoimmune atrophic gastritis, pernicious anaemia, pemphigus, pemphigus vulgarus, cirrhosis, primary biliary cirrhosis, dermatomyositis, polymyositis, fibromyositis, myogelosis, celiac disease, immunoglobulin A nephropathy, Henoch-Schonlein purpura, Evans syndrome, atopic dermatitis, psoriasis, psoriasis arthropathica, Graves' disease, Graves' ophthalmopathy, scleroderma, systemic scleroderma, progressive systemic scleroderma, asthma, allergy, primary biliary cirrhosis, Hashimoto's thyroiditis, primary myxedema, sympathetic ophthalmia, autoimmune uveitis, hepatitis, chronic action hepatitis, collagen diseases, ankylosing spondylitis, periarthritis humeroscapularis, panarteritis nodosa, chondrocalcinosis, Wegener's granulomatosis, microscopic polyangiitis, chronic urticaria, bullous skin disorders, pemphigoid, atopic eczema, Devic's disease, childhood autoimmune hemolytic anemia, Refractory or chronic Autoimmune Cytopenias, Prevention of development of Autoimmune Anti-Factor VIII Antibodies in Acquired Hemophilia A, Cold Agglutinin Disease, Neuromyelitis Optica, Stiff Person Syndrome, gingivitis, periodontitis, pancreatitis, myocarditis, vasculitis, gastritis, gout, gouty arthritis, and inflammatory skin disorders, selected from the group consisting of psoriasis, atopic dermatitis, eczema, rosacea, urticaria, and acne, normocomplementemic urticarial vasculitis, pericarditis, myositis, anti-synthetase syndrome, scleritis, macrophage activation syndrome, Bechet's Syndrome, PAPA Syndrome, Blau's Syndrome, gout, adult and juvenile Still's disease, cryropyrinopathy, Muckle-Wells syndrome, familial cold-induced auto-inflammatory syndrome, neonatal onset multisystemic inflammatory disease, familial Mediterranean fever, chronic infantile neurologic, cutaneous and articular syndrome, systemic juvenile idiopathic arthritis, Hyper IgD syndrome, Schnitzler's syndrome, autoimmune retinopathy, age-related macular degeneration, atherosclerosis, chronic prostatitis and TNF receptor-associated periodic syndrome (TRAPS).

Optionally the autoimmune disease is selected from the group consisting of any of the types and subtypes of any of multiple sclerosis, rheumatoid arthritis, type I diabetes, psoriasis, systemic lupus erythematosus, inflammatory bowel disease, uveitis, and Sjogren's syndrome.

According to at least some embodiments there is provided a method for treating or preventing an infectious disease comprising administering to a subject in need thereof an effective amount of any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition.

Optionally the infectious disease is selected from the disease caused by bacterial infection, viral infection, fungal infection and/or other parasite infection.

Optionally the infectious disease is selected from hepatitis B, hepatitis C, infectious mononucleosis, EBV, cytomegalovirus, AIDS, HIV-1, HIV-2, tuberculosis, malaria and schistosomiasis.

According to at least some embodiments, there is provided a method for treating or preventing cancer comprising administering to a subject in need thereof an effective amount of any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition.

Optionally the treatment is combined with another moiety or therapy useful for treating cancer.

Optionally the therapy is radiation therapy, antibody therapy, chemotherapy, photodynamic therapy, adoptive T cell therapy, Treg depletion, surgery or in combination therapy with conventional drugs.

Optionally the moiety is selected from the group consisting of immunosuppressants, cytotoxic drugs, tumor vaccines, antibodies (e.g. bevacizumab, erbitux), peptides, peptibodies, small molecules, chemotherapeutic agents such as cytotoxic and cytostatic agents (e.g. paclitaxel, cisplatin, vinorelbine, docetaxel, gemcitabine, temozolomide, irinotecan, 5FU, carboplatin), immunological modifiers such as interferons and interleukins, immunostimulatory antibodies, growth hormones or other cytokines, folic acid, vitamins, minerals, aromatase inhibitors, RNAi, Histone Deacetylase Inhibitors, and proteasome inhibitors.

Optionally the cancer is selected from a group consisting of breast cancer, cervical cancer, ovary cancer, endometrial cancer, melanoma, bladder cancer, lung cancer, pancreatic cancer, colon cancer, prostate cancer, leukemia, acute lymphocytic leukemia, chronic lymphocytic leukemia, B-cell lymphoma, Burkitt's lymphoma, multiple myeloma, Hodgkin's lymphoma, Non-Hodgkin's lymphoma, myeloid leukemia, acute myelogenous leukemia (AML), chronic myelogenous leukemia, thyroid cancer, thyroid follicular cancer, myelodysplastic syndrome (MDS), fibrosarcomas and rhabdomyosarcomas, melanoma, uveal melanoma, teratocarcinoma, neuroblastoma, glioma, glioblastoma, benign tumor of the skin, keratoacanthomas, renal cancer, anaplastic large-cell lymphoma, esophageal squamous cells carcinoma, hepatocellular carcinoma, follicular dendritic cell carcinoma, intestinal cancer, muscle-invasive cancer, seminal vesicle tumor, epidermal carcinoma, spleen cancer, bladder cancer, head and neck cancer, stomach cancer, liver cancer, bone cancer, brain cancer, cancer of the retina, biliary cancer, small bowel cancer, salivary gland cancer, cancer of uterus, cancer of testicles, cancer of connective tissue, prostatic hypertrophy, myelodysplasia, Waldenstrom's macroglobinaemia, nasopharyngeal, neuroendocrine cancer, myelodysplastic syndrome, mesothelioma, angiosarcoma, Kaposi's sarcoma, carcinoid, oesophagogastric, fallopian tube cancer, peritoneal cancer, papillary serous mullerian cancer, malignant ascites, gastrointestinal stromal tumor (GIST), Li-Fraumeni syndrome and Von Hippel-Lindau syndrome (VHL), and wherein the cancer is non-metastatic, invasive or metastatic.

Optionally the cancer is any of melanoma, cancer of liver, renal, brain, breast, colon, lung, ovary, pancreas, prostate, stomach, multiple myeloma, Hodgkin's lymphoma, non Hodgkin's lymphoma, acute and chronic lymphoblastic leukemia and acute and chronic myeloid leukemia.

According to at least some embodiments, there is provided a method for potentiating a secondary immune response to an antigen in a patient, which method comprises administering effective amount of any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition.

Optionally the antigen is a cancer antigen, a viral antigen or a bacterial antigen, and the patient has received treatment with an anticancer vaccine or a viral vaccine.

A method of immunotherapy in a patient, comprising:

in vivo or ex vivo tolerance induction, comprising administering effective amount of any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition, to a patient or to leukocytes isolated from the patient, in order to induce differentiation of tolerogenic regulatory cells;

ex-vivo enrichment and expansion of said cells;

reinfusion of the tolerogenic regulatory cells to said patient.

A method of using at least one of: any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition; as a cancer vaccine adjuvant, comprising administration to a patient an immunogenic amount of a tumor associated antigen preparation of interest; and a cancer vaccine adjuvant in a formulation suitable for immunization, wherein the immune response against the tumor associated antigen in the presence of the cancer vaccine adjuvant is stronger than in the absence of the cancer vaccine adjuvant.

According to at least some embodiments there is provided a method for combining therapeutic vaccination with an antigen along with administration of any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition, for treatment of infection.

According to at least some embodiments, there is provided a method for combining any of an isolated polypeptide as described herein, or a fusion protein as described herein; a nucleotide sequence as described herein; an expression vector as described herein; a host cell as described herein, or an antibody as described herein or a pharmaceutical composition, an adjuvant, and an antigen in a vaccine, in order to increase the immune response.

Optionally the antigen is a viral antigen, bacterial antigen, fungal antigen, parasite antigen, and/or other pathogen's antigen.

According to at least some embodiments, any one of the foregoing therapeutic agents according to at least some embodiments of the present invention, including antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, against any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins; LY6G6F, VSIG10, TMEM25 and/or LSR secreted or soluble form or ECD and/or variants, and/or orthologs, and/or conjugates thereof, can be used for adoptive immunotherapy. Immune tolerance or immunological tolerance is the process by which the immune system does not attack an antigen. It can be either ‘natural’ or ‘self tolerance’, where the body does not mount an immune response to self antigens, or ‘induced tolerance’, where tolerance to external antigens can be created by manipulating the immune system. It occurs in three forms: central tolerance, peripheral tolerance and acquired tolerance. Without wishing to be bound by a single theory, tolerance employs regulatory immune cells—including Tregs—that directly suppress autoreactive cells, as well as several other immune cell subsets with immunoregulatory properties—including CD8⁺ T cells and other types of CD4⁺ T cells (Tr1, Th3), in addition to natural killer (NK), NKT cells, dendritic cells (DC) and B cells.

Tolerance can be induced by blocking costimulation or upon engagement of a co-inhibitory B7 with its counter receptor. Transfer of tolerance involves isolation of the cells that have been induced for tolerance either in vivo (i.e. prior to cell isolation) or ex-vivo, enrichment and expansion of these cells ex vivo, followed by reinfusion of the expanded cells to the patient. This method can be used for treatment of autoimmune diseases as recited herein, immune related diseases as recited herein, transplantation and graft rejection. Thus, according to at least some embodiments, the invention provides methods for tolerance induction, comprising in vivo or ex vivo treatment administration of effective amount of any one of isolated soluble LY6G6F, VSIG10, TMEM25, LSR polypeptide, or a polypeptide comprising the extracellular domain of LY6G6F, VSIG10, TMEM25, LSR, or fragment thereof, or a fusion thereof to a heterologous sequence, and/or a polyclonal or monoclonal antibody or antigen binding fragments and conjugates containing same, and/or alternative scaffolds, specific to any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, to a patient or to leukocytes isolated from the patient, in order to induce differentiation of tolerogenic regulatory cells, followed by ex-vivo enrichment and expansion of said cells and reinfusion of the tolerogenic regulatory cells to said patient.

According to at least some embodiments, the invention provides assays for detecting the presence of LY6G6F, VSIG10, TMEM25 and/or LSR proteins in vitro or in vivo in a biological sample or an individual, comprising contacting the sample with an antibody and/or antigen binding fragments and/or conjugates containing same, and/or alternative scaffolds, having specificity for LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, and detecting the binding of LY6G6F, VSIG10, TMEM25 and/or LSR protein in the sample and/or in the individual.

According to at least some embodiments, there is provided an assay for detecting the presence of any one of the polypeptides of any of SEQ ID NOs:1-8, 11-18, 47-50, 58, 143, or a variant thereof that is at least 95% identical thereto, in a sample.

According to at least some embodiments, there is provided a method for diagnosing a disease in a subject, comprising detecting in the subject or in a sample obtained from said subject any one of the polypeptides of any of SEQ ID NOs:1-8, 11-18, 47-50, 58, 143, or a variant thereof that is at least 95% identical thereto, or fragments thereof.

Optionally detecting the polypeptide is performed in vivo or in vitro.

Optionally the detection is conducted by immunoassay.

Optionally the detection is conducted using antibodies or fragments as described herein.

According to at least some embodiments, the invention provides methods for detecting a disease, diagnosing a disease, monitoring disease progression or treatment efficacy or relapse of a disease, or selecting a therapy for a disease, detect cells affected by the foregoing disease, comprising detecting expression of a LY6G6F, VSIG10, TMEM25 and/or LSR, wherein the disease is selected from cancer, infectious disorder as recited herein, and/or immune related disorder.

According to one embodiment, detecting the presence of the polypeptide is indicative of the presence of the disease and/or its severity and/or its progress. According to another embodiment, a change in the expression and/or the level of the polypeptide compared to its expression and/or level in a healthy subject or a sample obtained therefrom is indicative of the presence of the disease and/or its severity and/or its progress. According to a further embodiment, a change in the expression and/or level of the polypeptide compared to its level and/or expression in said subject or in a sample obtained therefrom at earlier stage is indicative of the progress of the disease. According to still further embodiment, detecting the presence and/or relative change in the expression and/or level of the polypeptide is useful for selecting a treatment and/or monitoring a treatment of the disease.

BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1A, 1B, 1C-1 to 1C-3, 1D-1H, 1I-1, 1I-2, 1J-1 and 1J-2 present amino acid sequences of LY6G6F (FIG. 1A, SEQ ID NO:1), VSIG10 (FIG. 1B, SEQ ID NO:3, and 1C, SEQ ID NO:5), TMEM25 (FIG. 1D, SEQ ID NO:7), LSR (FIGS. 1E (SEQ ID NO:11), 1F (SEQ ID NO:13), 1G (SEQ ID NO:15), 1H (SEQ ID NO:16), 1I (SEQ ID NO:17), and 1J (SEQ ID NO:18)) proteins, fragments, ECDs and the corresponding nucleic acid sequences encoding same. Amino acid residues corresponding to signal peptide (SP) appear in bold Italics. Ig-V and/or Ig-C domains are shown in boxes. Amino acid residues corresponding to transmembrane region (TM) appear in bold and underlined. Amino acid residues corresponding to alternative exons skipping in some of the isoforms (in FIGS. 1B, and 1E) appear in Italics and underlined. Nucleic acid sequence corresponding to alternative exons skipping variants of VSIG10 (skipping exon 3), and LSR (isoform-e, skipping exons 3, 4 and 5) appears in bold in FIGS. 1C, and 1I, respectively. Nucleic acid sequence corresponding to transmembrane region (TM) appears in bold and underlined in FIG. 1C. Nucleic acid sequence corresponding to signal peptide (SP) appears in bold Italics in FIGS. 1C, 1E, 1G, 1H, 1I, and 1J. TGA stop codon is highlighted in FIGS. 1C, and H. FIG. 1A further shows an SP sequence, as a subsequence of SEQ ID NO 1, starting from amino acid number 1 and ending at amino acid number 16, and a TM sequence, as a subsequence of SEQ ID NO 1, starting from amino acid number 235 and ending at amino acid number 257. FIG. 1B further shows an SP sequence, as a subsequence of SEQ ID NO 3, starting from amino acid number 1 and ending at amino acid number 30, and a TM sequence, as a subsequence of SEQ ID NO 3, starting from amino acid number 414 and ending at amino acid number 434. FIG. 1C-1 further shows an SP sequence, as a subsequence of SEQ ID NO 5, starting from amino acid number 1 and ending at amino acid number 30, and a TM sequence, as a subsequence of SEQ ID NO 5, starting from amino acid number 313 and ending at amino acid number 333. FIG. 1D further shows an SP sequence, as a subsequence of SEQ ID NO 7, starting from amino acid number 1 and ending at amino acid number 26, and a TM sequence, as a subsequence of SEQ ID NO 7, starting from amino acid number 233 and ending at amino acid number 261. FIG. 1E further shows an SP sequence, as a subsequence of SEQ ID NO 11, starting from amino acid number 1 and ending at amino acid number 41, and a TM sequence, as a subsequence of SEQ ID NO 11, starting from amino acid number 212 and ending at amino acid number 234. FIG. 1F further shows an SP sequence, as a subsequence of SEQ ID NO 13, starting from amino acid number 1 and ending at amino acid number 41, and a TM sequence, as a subsequence of SEQ ID NO 13, starting from amino acid number 193 and ending at amino acid number 215. FIG. 1G further shows an SP sequence, as a subsequence of SEQ ID NO 15, starting from amino acid number 1 and ending at amino acid number 41. FIG. 1H further shows an SP sequence, as a subsequence of SEQ ID NO 16, starting from amino acid number 1 and ending at amino acid number 41. FIG. 1I-1 further shows an SP sequence, as a subsequence of SEQ ID NO 17, starting from amino acid number 1 and ending at amino acid number 41. FIG. 1J-1 further shows an SP sequence, as a subsequence of SEQ ID NO 18, starting from amino acid number 1 and ending at amino acid number 41.

FIGS. 2A-1, 2A-2, 2B-1(1), 2B-1(2), 2B-2(1), 2B-2(2), 2C-1(1), 2C-1(2), 2C-2(1), 2C-2(2), 2D-1(1), 2D-1(2), 2D-2(1), 2D-2(2), 2E-1(1), 2E-1(2), 2E-2(1), 2E-2(2), 2F-1, 2F-2, 2G-1(1), 2G-1(2), 2G-2(1) and 2G-2(2) present amino acid sequence comparison between: the VSIG10 variant SEQ ID NO:5 and the known VSIG10 protein, SEQ ID NO: 3 (genbank accession number NP_061959.2) (FIG. 2A); LSR isoform-a, SEQ ID NO:11 and known LSR protein, genbank accession number NP_991403 SEQ ID NO:62 (FIG. 2B-1); LSR isoform-a, SEQ ID NO:11 and known LSR protein, genbank accession number XP_002829104, SEQ ID NO:68 (FIG. 2B-2); LSR isoform-b, SEQ ID NO:13 and known LSR protein, genbank accession number NP_057009, SEQ ID NO:63 (FIG. 2C-1); LSR isoform-b, SEQ ID NO:13 and known LSR protein, genbank accession number BAC11614, SEQ ID NO:65 (FIG. 2C-2); LSR isoform-c, SEQ ID NO:15 and known LSR protein, genbank accession number NP_991404, SEQ ID NO:66 (FIG. 2D-1); LSR isoform-c, SEQ ID NO:15 and known LSR protein, genbank accession number XP_002829105.1, SEQ ID NO:69 (FIG. 2D-2); LSR isoform-d, SEQ ID NO:16 and known LSR protein, genbank accession number NP_991404, SEQ ID NO:66 (FIG. 2E-1); LSR isoform-d, SEQ ID NO:16 and known LSR protein, genbank accession number XP_002829105.1, SEQ ID NO:69 (FIG. 2E-2); LSR isoform-e, SEQ ID NO:17 and known LSR protein, genbank accession number BAG59226.1, SEQ ID NO:67 (FIG. 2F); LSR isoform-f, SEQ ID NO:18 and known LSR protein, genbank accession number NP_991403, SEQ ID NO:62 (FIG. 2G-1); LSR isoform-f, SEQ ID NO:18 and known LSR protein, genbank accession number NP_991404, SEQ ID NO:66 (FIG. 2G-2). The sequence of the unique edge portions (unique junction) of the VSIG10 variant (SEQ ID NO:5) and LSR variant (SEQ ID NO:18) are bold and highlighted (FIGS. 2A and 2G, respectively).

FIGS. 3A and 3B show scatter plots, demonstrating the expression of VSIG10 transcripts, that encode the VSIG10 proteins, on a virtual panel of all tissues and conditions using MED discovery engine, demonstrating differential expression of VSIG10 transcripts in several groups of cells from the immune system, mainly in leukocytes, and in various cancer conditions, such as CD10+ leukocytes from ALL and BM-CD34+ cells from AML.

FIGS. 4A-1, 4A-2, 4B-1, 4B-2, 4C-1, 4C-2, 4D-1, 4D-2 and 4E show scatter plots, demonstrating the expression of LSR transcripts, that encode the LSR proteins, on a virtual panel of all tissues and conditions using MED discovery engine, demonstrating differential expression of LSR transcripts in several groups of cells from the immune system, mainly in bone marrow cells, and in various cancerous conditions of tissues, such as in breast, lung, ovary, pancreas, prostate and skin cancers.

FIG. 5A presents LY6G6F human (SEQ ID NO: 1) and mouse (ref|NP_001156664.1, SEQ ID NO:29) amino acid sequence comparison. FIGS. 5B-1, 5B-2 present VSIG10 human (SEQ ID NO: 3) and mouse (sp|D3YX43.2, SEQ ID NO:30) amino acid sequence comparison. FIGS. 5C-1 to 5C-4 present LSR human (SEQ ID NO:11) and either mouse (ref|NP_059101.1, SEQ ID NO:31) or mouse (ref|NP_001157656.1, SEQ ID NO:32) amino acid sequence comparison. FIG. 5D presents TMEM25 human (SEQ ID NO:7) and mouse (ref: 1cl|4109, SEQ ID NO:28) amino acid sequence comparison.

FIG. 6 presents a table summarizing the primers which were used for cloning of LY6G6F transcript fused to EGFP. Gene specific sequences are shown in bold face; the restriction site extensions utilized for cloning purposes are in Italic; and Kozak sequence are underlined.

FIGS. 7-1 and 7-2 present the DNA sequence of LY6G6F full length_fused to EGFP (SEQ ID NO 55). The gene specific sequence corresponding to the LY6G6F full length sequence is marked in bold faced, EGFP sequence is unbold Italic underline.

FIG. 8 presents the amino acid sequence of the resulting LY6G6F full length fused to EGFP (SEQ ID NO. 56). The gene specific sequence corresponding to the full length sequence of LY6G6F is marked in bold faced; EGFP sequence is unbold Italic underline.

FIG. 9 presents cell localization of G6F EGFP fusion protein transiently expressed in HEK293T cells. The image was obtained using the 40× objective of the confocal microscope.

FIGS. 10 and 10A-10D present mouse ECDs fused to mouse IgG2a Fc as follows: mouse LY6G6F (also referred to herein as LY6G6F-Ig, FIG. 10A), mouse VSIG10 (FIG. 10B), mouse TMEM25 (also referred to herein as TMEM25-Ig, FIG. 10C) or mouse LSR (also referred to herein as LSR-Ig, FIG. 10D) ECD-mIgG2aFc fused proteins (SEQ ID NOs: 23, 24, 25, or 26, respectively). Amino acid residues corresponding to signal peptide (SP) are shown in Italics. Amino acid residues corresponding to ECD sequence are underlined. Amino acid residues corresponding to mouse IgG2a Fc are shown in bold face (SEQ ID NO:27).

FIGS. 11A-11J present amino acid sequences of human ECDs fused to human IgG1 Fc with the Cys at position 220 (according to full length human IgG1, position 5 in SEQ ID NO:70) replaced with a Ser (SEQ ID NO:156), as follows: human LY6G6F (FIG. 11A), human VSIG10 (FIG. 11B), human VSIG10-skipping exon 3 variant (FIG. 11C), human TMEM25 (FIG. 11D), human LSR isoform a (FIG. 11E), human LSR isoform b (FIG. 11F), human LSR isoform c (FIG. 11G), human LSR isoform d (FIG. 11H), human LSR isoform e (FIG. 11I), human LSR isoform f (FIG. 11J) ECD fused to human IgG1 Fc (SEQ ID NOs: 71-80, respectively). Amino acid residues corresponding to signal peptide (SP) are shown in bold Italics. Amino acid residues corresponding to human ECD sequence are underlined. Amino acid residues corresponding to human IgG1 Fc with the Cys at position 220 replaced with a Ser (SEQ ID NO:156) are unmarked.

FIGS. 12A-12C are histograms showing over expression of the LSR transcripts detectable by or according to LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) in cancerous ovary samples relative to the normal samples.

FIGS. 13A-13C are histograms showing over expression of the LSR transcripts detectable by or according to LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) in cancerous breast samples relative to the normal samples.

FIGS. 14A, 14B are histograms showing over expression of the LSR transcripts detectable by or according to LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) in cancerous lung samples relative to the normal samples.

FIGS. 15A, 15B are histograms showing over expression of the LSR transcripts detectable by or according to LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) in normal tissue samples relative to the ovary samples.

FIG. 16 is a histogram showing over expression of the LSR transcripts detectable by or according to LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) in cancerous kidney samples relative to the normal samples.

FIG. 17 is a histogram showing over expression of the LSR transcripts detectable by or according to LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) in cancerous liver samples relative to the normal samples.

FIG. 18 demonstrates Western Blot analysis of the expression of LSR_P5a_Flag_m protein (SEQ ID: 144) in stably-transfected recombinant HEK293T cells, as detected with anti Flag (Sigma cat #A8592) (FIG. 18A) and anti LSR antibodies as follow: Abnova, cat #H00051599-B01P (FIG. 18B) Abcam, cat ab59646 (FIG. 18C) and Sigma cat #HPA007270 (FIG. 18D). Lane 1: HEK293T_pIRESpuro3; lane 2: HEK293T_pIRESpuro3_LSR_P5a_Flag.

FIGS. 19A-19D demonstrate the subcellular localization of LSR_P5a_Flag_m. LSR_P5a_Flag_m (SEQ ID NO: 144) is localized mainly to the cell cytoplasm, but can also be detected on the cell surface as detected with anti Flag (Sigma cat #A9594) (FIG. 19A) and anti LSR antibodies as follows: Abcam, cat ab59646 (FIG. 19B) Abnova, cat #H00051599-B01P (FIG. 19C) and Sigma cat #HPA007270 (FIG. 19D).

FIG. 20 demonstrates the endogenous expression of LSR in various cell lines. A band at 72 kDa corresponding to LSR was detected with anti LSR antibody in extracts of (1) Caov3, (2) ES2, (3) OV-90, (4) OVCAR3, (5) SK-OV3, (6) TOV112D, (7) CaCo2, (8) HeLa, (9) Hep G2, (10) MCF-7, (11) SkBR3 and (12) 293T_LSR_P5a_Flag (FIG. 20A). Anti GAPDH (Abcam cat #ab9484) served as a loading control (FIG. 20B).

FIGS. 21A-21C are histogram showing expression of TMEM25 transcripts detectable by or according to seg21-27-TMEM25_seg_21-27_200-344/346_Amplicon (SEQ ID NO: 123) in normal and cancerous Breast tissues.

FIGS. 22A-22C are histograms showing expression of TMEM25 transcripts detectable by or according to seg21-27-TMEM25_seg_21-27_200-344/346_Amplicon (SEQ ID NO: 123) in different normal tissues.

FIGS. 23A, 23B demonstrate Western blot results showing (A) specific interaction between Rabbit anti TMEM25 antibodies and TMEM25_P5 protein (SEQ ID NO: 7) and TMEM25_P5_Flag (SEQ ID NO: 129), but not HEK_293_TpRp3. (B) specific interaction between TMEM25_P5_Flag protein (SEQ ID NO: 129) and anti-Flag antibodies Lane1: HEK293_TpIRESpuro3; lane 2: HEK293_TpIRESpuro3_TMEM25-P5, lane 3: HEK293_TpIRESpuro3_TMEM25-P5-Flag.

FIGS. 24A-24C present the cell surface localization of TMEM25_P5 (SEQ ID NO:132) (FIG. 24A) and TMEM25_P5_Flag (SEQ ID NO: 129) (FIG. 24B) using anti TMEM25 Abs. FIG. 24C demonstrate TMEM25_P5_Flag (SEQ ID NO: 129) localization using anti flag Abs (Sigma, catalog number: A9594).

FIG. 25 demonstrates that anti TMEM25 antibodies bind to the full length TMEM25 protein, in HEK293T recombinant cells expressing TMEM25_P5_Flag protein (1:2250) (FIG. 25A), as compared to mouse serum (1:2250) (FIG. 25B) used as a negative control, indicating membrane localization of TMEM25 protein.

FIG. 26 presents Western Blot results showing the expression of endogenous TMEM25 protein in various cell lines: (1): HEK293_TpIRESpuro3, (2) HEK293_TpIRESpuro3_TMEM25-P5-Flag, (3) KARPAS, (4) G-361, (5) RPMI8226, (6) DAUDI, (7) Jurkat.

FIG. 27 demonstrates specific knockdown of TMEM25_P5_Flag protein (SEQ ID NO: 129) in HEK293T cells stably expressing TMEM25_P5_Flag (SEQ ID NO 129) transfected with TMEM25_P5 siRNA (L-018183-00-0005, Dharmacon) (Lane 2) compared to HEK293T cells stably expressing TMEM25_P5_FLAG transfected with Scrambled-SiRNA (Lane 1) (Dharmacon, D-001810-10-05), using anti TMEM25 antibodies (Sigma, cat #HPA012163).

FIGS. 28A-28F demonstrate that anti LSR (Cat no. ab59646, Abcam) in sections of positive control cell line (LSR_P5a_Flag_m transfected HEK293T cells (column 1, panels A, C and E) shows specific immunoreactivity in a dose dependent concentrations of 3, 1 and 0.3 ug/ml respectively, as compared to the negative control cell line empty vector HEK293T cells (column 2, panels B, D and F), in pH 9 antigen retrieval method.

FIGS. 29A-29F demonstrate that anti TMEM25 (Cat no. HPA012163, Sigma) in sections of positive control cell line TMEM25_P5_Flag transfected HEK293T cells (column 1, panels A, C and E) shows specific immunoreactivity in a dose dependent concentrations of 3, 1 and 0.3 ug/ml respectively, as compared to the negative control cell line empty vector HEK293T cells (column 2 panels B, D and F), in pH 9 antigen retrieval method.

FIGS. 30A-30E show the in vitro inhibitory effect of soluble LY6G6F-Ig (SEQ ID NO:23), TMEM25-Ig (SEQ ID NO:25) and LSR-Ig (SEQ ID NO:26) on mouse T cells activation. Activation of T cells isolated from spleens of D011.10 mice was induced with 20 ug/ml (FIGS. 30A-C, E) or 2 ug/ml (Figures D and F) OVA323-339 in the presence of irradiated splenocyted from Balb/c mice that serve as APCs. In these studies CTLA4-Ig or B7-H4-Ig were used as positive controls while mouse IgG2a was used as Ig control.

FIG. 31 shows the in vitro inhibitory effect of bead bound LSR-Ig (SEQ ID NO:26) on T cell proliferation induced by anti-CD3 and anti-CD28 coated beads.

FIGS. 32A and 32B show the effect of LY6G6F, VSIG10, TMEM25 and LSR fusion proteins (SEQ ID NO:23-26, respectively) on CD4 T cell activation, as manifested by reduced IFNγ secretion (A) and reduced expression of the activation marker CD69 (B). Each bar is the mean of duplicate cultures, the error bars indicating the standard deviation (Student t-test,*P<0.05, **p<0.01, compared with control mIgG2a.

FIGS. 33A-33D show the effect of stimulator cells (a murine thymoma cell line, Bw5147, which were engineered to express membrane-bound anti-human CD3 antibody fragments) expressing the cDNAs encoding human LY6G6F, TMEM25 or LSR (SEQ ID NOs: 1, 7 or 11, respectively) on the proliferation (CPM) of bulk human T cells (FIG. 33A), CD4+ human T cells (FIG. 33B), CD8+ human T cells (FIG. 33C), or naïve CD4CD45RA+ human T cells (FIG. 33D). Results are displayed as the mean+/−SEM of 6 (FIG. 337A) or 3 (FIGS. 33B, C, and D) experiments. *P<0.05, **p<0.01, ***p<0.001, and #p<0.0001 (Students T-test) represent significantly different results compared to empty vector.

FIGS. 34A, 34B show the therapeutic effect of LSR-Ig (SEQ ID NO:26) or TMEM25-Ig (SEQ ID NO:25) treatment in the PLP139-151-induced R-EAE model in SJL mice. LSR-Ig (SEQ ID NO:26) or TMEM25-Ig (SEQ ID NO:25) were administered in a therapeutic mode from the onset of disease remission (day 18), at 100 microg/mouse i.p. 3 times per week for two weeks. Therapeutic effects of LSR-Ig and TMEM25-Ig on clinical symptoms are demonstrated as reduction in Mean Clinical Score (FIG. 34A). In addition, LSR-Ig and TMEM25-Ig treatment inhibited DTH responses to inducing epitope (PLP139-151) or spread epitope (PLP178-191), on day 35 after R-EAE induction (FIG. 34B). In this study the effect of LSR-Ig or TMEM25-Ig was studied in comparison to mIgG2a Ig negative control and CTLA4-Ig positive control that were administered at a similar regimen as the test proteins.

FIGS. 35A-35E show the dose dependency and mode of action of the effect of TMEM25-Ig (SEQ ID NO:25) in the R-EAE model in SJL mice. In this study, treatments were given from onset of disease remission (day 19) at 100, 30 or 10 microg/mouse i.p. 3 times per week for two weeks, as compared to 100 microg/mouse IgG2a control that was given at a similar schedule. shown are effects of TMEM25-Ig treatment on disease course (FIG. 35A), DTH responses to spread epitopes PLP178-191 and MBP84-104 on days 45 and 76 post R-EAE induction (FIG. 35B), ex-vivo recall responses of splenocytes isolated on day 45 and 75 post disease induction (FIG. 35C) and LN cells isolated on day 45 post disease induction (FIG. 35D) as manifested by the effect of TMEM25-Ig treatment on cell proliferation and cytokine secretion (IFNg, IL-17, IL-10 and IL-4). The effect of TMEM25-Ig on cell counts in the spleen, lymph nodes and CNS as well as the different linages present in the CNS upon treatment with TMEM25-Ig at 100 ug/dose is shown in FIG. 35E.

FIGS. 36A-36E show the therapeutic effect of VSIG10-Ig (SEQ ID NO:24) treatment in the PLP139-151-induced R-EAE model in SJL mice. VSIG10-Ig (SEQ ID NO:24) was administered in a therapeutic mode from the onset of disease remission (day 19), at 100 microg/mouse i.p. 3 times per week for two weeks. Therapeutic effects of VSIG10-Ig on clinical symptoms is demonstrated as reduction in Mean Clinical Score (FIG. 36A). In addition, VSIG10-Ig treatment inhibited DTH responses to spread epitopes (PLP178-191 and MBP MBP84-104), on days 45 and 76 after R-EAE induction (FIG. 36B). Also shown is the effect of VSIG10-Ig on ex-vivo recall responses of splenocytes isolated on day 45 and 75 post disease induction (FIG. 36C) and LN cells isolated on day 45 post disease induction (FIG. 36D) as manifested by the effect of VSIG10-Ig treatment on cell proliferation and cytokine secretion (IFNg, IL-17, IL-10 and IL-4). The effect of VSIG10-Ig on cell counts in the spleen, lymph nodes and CNS as well as the different linages present within each of these tissues upon treatment with VSIG10-Ig at 100 ug/dose is shown in FIG. 36E. In this study the effect of VSIG10-Ig was studied in comparison to mIgG2a Ig control that was administered at similar dose and regimen as VSIG10-Ig.

FIGS. 37A-37C show the therapeutic effect of LSR-Ig (SEQ ID NO:26) administered at 100 microg/mouse, i.p, 3 times per week for 10 days in collagen induced arthritis (CIA) model of Rhematoid Arthritis. Measured are clinical score (A) paw swelling (B) and histological damage (C) CTLA4-Ig, (100 microg/mouse) and TNFR-Ig (etanercept) were used as a positive control while mIgG2a Ig control (100 microg/mouse) was used as negative control.

FIG. 38 shows the therapeutic effect of LY6G6F-Ig (SEQ ID NO:23) administered at 25 mg/kg, i.p, 3 times per week for 2 weeks in collagen induced arthritis (CIA) model of Rhematoid Arthritis, with measurements given according to clinical scores.

For FIGS. 12-17, 21, 22, division was made into separate parts “A”, “B” and so forth for reasons of space only, so as to be able to show all results.

DETAILED DESCRIPTION OF THE INVENTION

The present invention, in at least some embodiments, relates to any one of the proteins referred to as LY6G6F, VSIG10, TMEM25 and/or LSR, and its corresponding nucleic acid sequence, and portions and variants thereof and fusion proteins and conjugates containing, and/or polyclonal and monoclonal antibodies and/or antigen binding fragments and/or conjugates containing same, and/or alternative scaffolds thereof that bind LY6G6F, VSIG10, TMEM25 and/or LSR and/or portions and/or variants thereof, and the use thereof as a therapeutic and/or diagnostic agent, and various uses as described herein.

US Patent Application Nos. US2009117566, US20090017473, and other family members, assigned to GENENTECH INC., disclose a 382 amino acid LY6G6F protein sequence (DNA234441, tumor-associated antigenic target (TAT) TAT201, SEQ ID NO:92 therein) having a transmembrane domain between residues 234-254 and 354-374. '566, '473, applications and other applications from this patent family disclose that TAT201 is over expressed in colon and rectal cancers. PCT Application Nos WO2003083074 and WO2004046342 disclose a 382 amino acid LY6G6F protein sequence as one of many genes that are over expressed in colon cancer cells. These patent applications further purportedly relate to methods of use of LY6G6F for detecting and treating colon cancer. However, these patent applications do not teach or suggest or provide any incentive that would direct a skilled artisan to use antibodies specific to the LY6G6F and/or LY6G6F ECD for treatment and/or diagnosis of cancer other than colorectal cancer, and/or infectious disorders, and/or immune related disorders. These patent applications do not describe LY6G6F ECD and do not teach or suggest or provide any incentive that would direct a skilled artisan to use the LY6G6F ECD for treatment of cancer and/or infectious disorders, and/or immune related disorders.

TMEM25 is disclosed in PCT Application Nos WO9958642 and WO2003087300, and US Patent Application Nos. US2007041963 and US2005202526, as one of many (hundreds to thousands) proteins, useful for diagnosing, preventing, and treating disorders associated with an abnormal expression or activity of these proteins. However, these applications do not teach or suggest or provide any incentive that would direct a skilled artisan to use antibodies specific to the TMEM25 and/or TMEM25 ECD for treatment and/or diagnosis of cancer and/or infectious disorders, and/or immune related disorders. TMEM25 is also disclosed in US Patent Application No. US2004010134, as one of hundreds of albumin fusion proteins, useful for diagnosing, treating, preventing or ameliorating diseases or disorders e.g. cancer, anemia, arthritis, asthma, inflammatory bowel disease or Alzheimer's disease. However, this application does not teach or suggest or provide any incentive that would direct a skilled artisan to use antibodies specific to the TMEM25 and/or TMEM25 ECD for treatment and/or diagnosis of cancer and/or infectious disorders, and/or immune related disorders. TMEM25 is also described in Doolan P, et al., Tumour Biol. 2009, 30(4):200-9 as a favourable prognostic and predictive biomarker for breast cancer diagnosis. However, this publication does not teach or suggest or provide any incentive that would direct a skilled artisan to use the antibodies specific to TMEM25 and/or TMEM25 ECD for treatment of cancer and/or infectious disorders, and/or immune related disorders.

In order that the present invention in various embodiments may be more readily understood, certain terms are first defined. Additional definitions are set forth throughout the detailed description.

As used herein the term “isolated” refers to a compound of interest (for example a polynucleotide or a polypeptide) that is in an environment different from that in which the compound naturally occurs e.g. separated from its natural milieu such as by concentrating a peptide to a concentration at which it is not found in nature. “Isolated” includes compounds that are within samples that are substantially enriched for the compound of interest and/or in which the compound of interest is partially or substantially purified.

An “immune cell” refers to any cell from the hemopoietic origin including but not limited to T cells, B cells, monocytes, dendritic cells, and macrophages.

As used herein, the term “polypeptide” refers to a chain of amino acids of any length, regardless of modification (e.g., phosphorylation or glycosylation).

As used herein, a “costimulatory polypeptide” or “costimulatory molecule” is a polypeptide that, upon interaction with a cell-surface molecule on T cells, modulates T cell responses.

As used herein, a “costimulatory signaling” is the signaling activity resulting from the interaction between costimulatory polypeptides on antigen presenting cells and their receptors on T cells during antigen-specific T cell responses. Without wishing to be limited by a single hypothesis, the antigen-specific T cell response is believed to be mediated by two signals: 1) engagement of the T cell Receptor (TCR) with antigenic peptide presented in the context of MHC (signal 1), and 2) a second antigen-independent signal delivered by contact between different costimulatory receptor/ligand pairs (signal 2). Without wishing to be limited by a single hypothesis, this “second signal” is critical in determining the type of T cell response (activation vs inhibition) as well as the strength and duration of that response, and is regulated by both positive and negative signals from costimulatory molecules, such as the B7 family of proteins.

As used herein, the term “B7” polypeptide means a member of the B7 family of proteins that costimulate T cells including, but not limited to B7-1, B7-2, B7-DC, B7-H5, B7-H1, B7-H2, B7-H3, B7-H4, B7-H6, B7-S3 and biologically active fragments and/or variants thereof. Representative biologically active fragments include the extracellular domain or fragments of the extracellular domain that costimulate T cells.

As used herein, a “variant” polypeptide contains at least one amino acid sequence alteration as compared to the amino acid sequence of the corresponding wild-type polypeptide.

As used herein, “conservative” amino acid substitutions are substitutions wherein the substituted amino acid has similar structural or chemical properties. As used herein, the term “host cell” refers to prokaryotic and eukaryotic cells into which a recombinant vector can be introduced.

As used herein, the term “an edge portion” or “a new junction” refers to a connection between two portions of a splice variant according to the present invention that were not joined in the wild type or known protein. An edge may optionally arise due to a join between the above “known protein” portion of a variant and the tail, for example, and/or may occur if an internal portion of the wild type sequence is no longer present, such that two portions of the sequence are now contiguous in the splice variant that were not contiguous in the known protein. A “bridge” may optionally be an edge portion as described above, but may also include a join between a head and a “known protein” portion of a variant, or a join between a tail and a “known protein” portion of a variant, or a join between an insertion and a “known protein” portion of a variant.

In some embodiments, a bridge between a tail or a head or a unique insertion, and a “known protein” portion of a variant, comprises at least about 10 amino acids, or in some embodiments at least about 20 amino acids, or in some embodiments at least about 30 amino acids, or in some embodiments at least about 40 amino acids, in which at least one amino acid is from the tail/head/insertion and at least one amino acid is from the “known protein” portion of a variant. In some embodiments, the bridge may comprise any number of amino acids from about 10 to about 40 amino acids (for example, 10, 11, 12, 13 . . . 37, 38, 39, 40 amino acids in length, or any number in between).

It should be noted that a bridge cannot be extended beyond the length of the sequence in either direction, and it should be assumed that every bridge description is to be read in such manner that the bridge length does not extend beyond the sequence itself.

Furthermore, bridges are described with regard to a sliding window in certain contexts below. For example, certain descriptions of the bridges feature the following format: a bridge between two edges (in which a portion of the known protein is not present in the variant) may optionally be described as follows: a bridge portion of CONTIG-NAME_P1 (representing the name of the protein), comprising a polypeptide having a length “n”, wherein n is at least about 10 amino acids in length, optionally at least about 20 amino acids, at least about 30 amino acids, at least about 40 amino acids, or at least about 50 amino acids in length, wherein at least two amino acids comprise XX (2 amino acids in the center of the bridge, one from each end of the edge), having a structure as follows (numbering according to the sequence of CONTIG-NAME_P1): a sequence starting from any of amino acid numbers 49−x to 49 (for example); and ending at any of amino acid numbers 50+((n−2)−x) (for example), in which x varies from 0 to n−2. In this example, it should also be read as including bridges in which n is any number of amino acids between 10-50 amino acids in length. Furthermore, the bridge polypeptide cannot extend beyond the sequence, so it should be read such that 49−x (for example) is not less than 1, nor 50+((n−2)−x) (for example) greater than the total sequence length.

The term “cancer” as used herein should be understood to encompass any neoplastic disease (whether invasive or metastatic) which is characterized by abnormal and uncontrolled cell division causing malignant growth or tumor. Non-limiting examples of cancer which may be treated with a compound according to at least some embodiments of the present invention are solid tumors, sarcomas and hematological malignancies, including but not limited to breast cancer (e.g. breast carcinoma), cervical cancer, ovary cancer (ovary carcinoma), endometrial cancer, melanoma, bladder cancer (bladder carcinoma), lung cancer (e.g. adenocarcinoma and non-small cell lung cancer), pancreatic cancer (e.g. pancreatic carcinoma such as exocrine pancreatic carcinoma), colon cancer (e.g. colorectal carcinoma, such as colon adenocarcinoma and colon adenoma), prostate cancer including the advanced disease, hematopoietic tumors of lymphoid lineage (e.g. leukemia, acute lymphocytic leukemia, chronic lymphocytic leukemia, B-cell lymphoma, Burkitt's lymphoma, multiple myeloma, Hodgkin's lymphoma, Non-Hodgkin's lymphoma), myeloid leukemia (for example, acute myelogenous leukemia (AML), chronic myelogenous leukemia), thyroid cancer, thyroid follicular cancer, myelodysplastic syndrome (MDS), tumors of mesenchymal origin (e.g. fibrosarcomas and rhabdomyosarcomas), melanoma, uveal melanoma, teratocarcinoma, neuroblastoma, glioma, glioblastoma, benign tumor of the skin (e.g. keratoacanthomas), renal cancer, anaplastic large-cell lymphoma, esophageal squamous cells carcinoma, hepatocellular carcinoma, follicular dendritic cell carcinoma, intestinal cancer, muscle-invasive cancer, seminal vesicle tumor, epidermal carcinoma, spleen cancer, bladder cancer, head and neck cancer, stomach cancer, liver cancer, bone cancer, brain cancer, cancer of the retina, biliary cancer, small bowel cancer, salivary gland cancer, cancer of uterus, cancer of testicles, cancer of connective tissue, prostatic hypertrophy, myelodysplasia, Waldenstrom's macroglobinaemia, nasopharyngeal, neuroendocrine cancer, myelodysplastic syndrome, mesothelioma, angiosarcoma, Kaposi's sarcoma, carcinoid, oesophagogastric, fallopian tube cancer, peritoneal cancer, papillary serous mullerian cancer, malignant ascites, gastrointestinal stromal tumor (GIST), and a hereditary cancer syndrome such as Li-Fraumeni syndrome and Von Hippel-Lindau syndrome (VHL), and wherein the cancer may be non-metastatic, invasive or metastatic.

According to at least some preferred embodiments of the present invention, the cancer is selected from the group consisting of melanoma, cancers of liver, renal, brain, breast, colon, lung, ovary, pancreas, prostate, stomach, multiple myeloma and hematopoietic cancer, including but not limited to lymphoma (Hodgkin's and non Hodgkin's), acute and chronic lymphoblastic leukemia and acute and chronic myeloid leukemia, and wherein the cancer may be non-metastatic, invasive or metastatic.

The term “autoimmune disease” as used herein should be understood to encompass any autoimmune disease and chronic inflammatory conditions. According to at least some embodiments of the invention, the autoimmune diseases should be understood to encompass any disease disorder or condition selected from the group including but not limited to multiple sclerosis, including relapsing-remitting multiple sclerosis, primary progressive multiple sclerosis, and secondary progressive multiple sclerosis; psoriasis; rheumatoid arthritis; psoriatic arthritis, systemic lupus erythematosus (SLE); ulcerative colitis; Crohn's disease; benign lymphocytic angiitis, thrombocytopenic purpura, idiopathic thrombocytopenia, idiopathic autoimmune hemolytic anemia, pure red cell aplasia, Sjogren's syndrome, rheumatic disease, connective tissue disease, inflammatory rheumatism, degenerative rheumatism, extra-articular rheumatism, juvenile rheumatoid arthritis, arthritis uratica, muscular rheumatism, chronic polyarthritis, cryoglobulinemic vasculitis, ANCA-associated vasculitis, antiphospholipid syndrome, myasthenia gravis, autoimmune haemolytic anaemia, Guillian-Barre syndrome, chronic immune polyneuropathy, autoimmune thyroiditis, insulin dependent diabetes mellitus, type I diabetes, Addison's disease, membranous glomerulonephropathy, Goodpasture's disease, autoimmune gastritis, autoimmune atrophic gastritis, pernicious anaemia, pemphigus, pemphigus vulgarus, cirrhosis, primary biliary cirrhosis, dermatomyositis, polymyositis, fibromyositis, myogelosis, celiac disease, immunoglobulin A nephropathy, Henoch-Schonlein purpura, Evans syndrome, atopic dermatitis, psoriasis, psoriasis arthropathica, Graves' disease, Graves' ophthalmopathy, scleroderma, systemic scleroderma, progressive systemic scleroderma, asthma, allergy, primary biliary cirrhosis, Hashimoto's thyroiditis, primary myxedema, sympathetic ophthalmia, autoimmune uveitis, hepatitis, chronic action hepatitis, collagen diseases, ankylosing spondylitis, periarthritis humeroscapularis, panarteritis nodosa, chondrocalcinosis, Wegener's granulomatosis, microscopic polyangiitis, chronic urticaria, bullous skin disorders, pemphigoid, atopic eczema, Devic's disease, childhood autoimmune hemolytic anemia, Refractory or chronic Autoimmune Cytopenias, Prevention of development of Autoimmune Anti-Factor VIII Antibodies in Acquired Hemophilia A, Cold Agglutinin Disease, Neuromyelitis Optica, Stiff Person Syndrome, gingivitis, periodontitis, pancreatitis, myocarditis, vasculitis, gastritis, gout, gouty arthritis, and inflammatory skin disorders, selected from the group consisting of psoriasis, atopic dermatitis, eczema, rosacea, urticaria, and acne, normocomplementemic urticarial vasculitis, pericarditis, myositis, anti-synthetase syndrome, scleritis, macrophage activation syndrome, Bechet's Syndrome, PAPA Syndrome, Blau's Syndrome, gout, adult and juvenile Still's disease, cryropyrinopathy, Muckle-Wells syndrome, familial cold-induced auto-inflammatory syndrome, neonatal onset multisystemic inflammatory disease, familial Mediterranean fever, chronic infantile neurologic, cutaneous and articular syndrome, systemic juvenile idiopathic arthritis, Hyper IgD syndrome, Schnitzler's syndrome, autoimmune retinopathy, age-related macular degeneration, atherosclerosis, chronic prostatitis and TNF receptor-associated periodic syndrome (TRAPS).

Optionally and preferably, the autoimmune disease includes but is not limited to any of the types and subtypes of any of multiple sclerosis, rheumatoid arthritis, type I diabetes, psoriasis, systemic lupus erythematosus, inflammatory bowel disease, uveitis, or Sjogren's syndrome.

As used herein, “multiple sclerosis” comprises one or more of multiple sclerosis, benign multiple sclerosis, relapsing remitting multiple sclerosis, secondary progressive multiple sclerosis, primary progressive multiple sclerosis, progressive relapsing multiple sclerosis, chronic progressive multiple sclerosis, transitional/progressive multiple sclerosis, rapidly worsening multiple sclerosis, clinically-definite multiple sclerosis, malignant multiple sclerosis, also known as Marburg's Variant, and acute multiple sclerosis. Optionally, “conditions relating to multiple sclerosis” include, e.g., Devic's disease, also known as Neuromyelitis Optica; acute disseminated encephalomyelitis, acute demyelinating optic neuritis, demyelinative transverse myelitis, Miller-Fisher syndrome, encephalomyelradiculoneuropathy, acute demyelinative polyneuropathy, tumefactive multiple sclerosis and Balo's concentric sclerosis.

As used herein, “rheumatoid arthritis” comprises one or more of rheumatoid arthritis, gout and pseudo-gout, juvenile idiopathic arthritis, juvenile rheumatoid arthritis, Still's disease, ankylosing spondylitis, rheumatoid vasculitis. Optionally, conditions relating to rheumatoid arthritis include, e.g., osteoarthritis, sarcoidosis, Henoch-Schonlein purpura, Psoriatic arthritis, Reactive arthritis, Spondyloarthropathy, septic arthritis, Haemochromatosis, Hepatitis, vasculitis, Wegener's granulomatosis, Lyme disease, Familial Mediterranean fever, Hyperimmunoglobulinemia D with recurrent fever, TNF receptor associated periodic syndrome, and Enteropathic arthritis associated with inflammatory bowel disease.

As used herein, “Uveitis” comprises one or more of uveitis, anterior uveitis (or iridocyclitis), intermediate uveitis (pars planitis), posterior uveitis (or chorioretinitis) and the panuveitis form.

As used herein, “inflammatory bowel disease” comprises one or more of inflammatory bowel disease Crohn's disease, ulcerative colitis (UC), Collagenous colitis, Lymphocytic colitis, Ischaemic colitis, Diversion colitis, Behcçet's disease, Indeterminate colitis.

As used herein, “psoriasis” comprises one or more of psoriasis, Nonpustular Psoriasis including Psoriasis vulgaris and Psoriatic erythroderma (erythrodermic psoriasis), Pustular psoriasis including Generalized pustular psoriasis (pustular psoriasis of von Zumbusch), Pustulosis palmaris et plantaris (persistent palmoplantar pustulosis, pustular psoriasis of the Barber type, pustular psoriasis of the extremities), Annular pustular psoriasis, Acrodermatitis continua, Impetigo herpetiformis. Optionally, conditions relating to psoriasis include, e.g., drug-induced psoriasis, Inverse psoriasis, Napkin psoriasis, Seborrheic-like psoriasis, Guttate psoriasis, Nail psoriasis, Psoriatic arthritis.

As used herein, “type 1 diabetes” comprises one or more of type 1 diabetes, insulin-dependent diabetes mellitus, idiopathic diabetes, juvenile type 1 diabetes, maturity onset diabetes of the young, latent autoimmune diabetes in adults, gestational diabetes. Conditions relating to type 1 diabetes include, neuropathy including polyneuropathy, mononeuropathy, peripheral neuropathy and autonomicneuropathy; eye complications: glaucoma, cataracts, retinopathy.

As used herein, “Sjogren's syndrome” comprises one or more of Sjogren's syndrome, Primary Sjogren's syndrome and Secondary Sjogren's syndrome, as well as conditions relating to Sjogren's syndrome including connective tissue disease, such as rheumatoid arthritis, systemic lupus erythematosus, or scleroderma. Other complications include pneumonia, pulmonary fibrosis, interstitial nephritis, inflammation of the tissue around the kidney's filters, glomerulonephritis, renal tubular acidosis, carpal tunnel syndrome, peripheral neuropathy, cranial neuropathy, primary biliary cirrhosis (PBC), cirrhosis, Inflammation in the esophagus, stomach, pancreas, and liver (including hepatitis), Polymyositis, Raynaud's phenomenon, Vasculitis, Autoimmune thyroid problems, lymphoma.

As used herein, “systemic lupus erythematosus”, comprises one or more of systemic lupus erythematosus, discoid lupus, lupus arthritis, lupus pneumonitis, lupus nephritis. Conditions relating to systemic lupus erythematosus include osteoarticular tuberculosis, antiphospholipid antibody syndrome, inflammation of various parts of the heart, such as pericarditis, myocarditis, and endocarditis, Lung and pleura inflammation, pleuritis, pleural effusion, chronic diffuse interstitial lung disease, pulmonary hypertension, pulmonary emboli, pulmonary hemorrhage, and shrinking lung syndrome, lupus headache, Guillain-Barré syndrome, aseptic meningitis, demyelinating syndrome, mononeuropathy, mononeuritis multiplex, myasthenia gravis, myelopathy, cranial neuropathy, polyneuropathy, vasculitis.

The term “immune related disease (or disorder or condition)” as used herein should be understood to encompass any disease disorder or condition selected from the group including but not limited to autoimmune diseases, inflammatory disorders and immune disorders associated with graft transplantation rejection, such as acute and chronic rejection of organ transplantation, allogenic stem cell transplantation, autologous stem cell transplantation, bone marrow transplantation, and graft versus host disease.

As used herein the term “inflammatory disorders” and/or “inflammation”, used interchangeably, includes inflammatory abnormalities characterized by disregulated immune response to harmful stimuli, such as pathogens, damaged cells, or irritants. Inflammatory disorders underlie a vast variety of human diseases. Non-immune diseases with etiological origins in inflammatory processes include cancer, atherosclerosis, and ischaemic heart disease. Examples of disorders associated with inflammation include: Chronic prostatitis, Glomerulonephritis, Hypersensitivities, Pelvic inflammatory disease, Reperfusion injury, Sarcoidosis, Vasculitis, Interstitial cystitis, normocomplementemic urticarial vasculitis, pericarditis, myositis, anti-synthetase syndrome, scleritis, macrophage activation syndrome, Bechet's Syndrome, PAPA Syndrome, Blau's Syndrome, gout, adult and juvenile Still's disease, cryropyrinopathy, Muckle-Wells syndrome, familial cold-induced auto-inflammatory syndrome, neonatal onset multisystemic inflammatory disease, familial Mediterranean fever, chronic infantile neurologic, cutaneous and articular syndrome, systemic juvenile idiopathic arthritis, Hyper IgD syndrome, Schnitzler's syndrome, TNF receptor-associated periodic syndrome (TRAPSP), gingivitis, periodontitis, hepatitis, cirrhosis, pancreatitis, myocarditis, vasculitis, gastritis, gout, gouty arthritis, and inflammatory skin disorders, selected from the group consisting of psoriasis, atopic dermatitis, eczema, rosacea, urticaria, and acne.

As used herein the term “infectious disorder and/or disease” and/or “infection”, used interchangeably, includes any disorder, disease and/or condition caused by presence and/or growth of pathogenic biological agent in an individual host organism. As used herein the term “infection” comprises the disorder, disease and/or condition as above, exhibiting clinically evident illness (i.e., characteristic medical signs and/or symptoms of disease) and/or which is asymtomatic for much or all of it course. As used herein the term “infection” also comprises disorder, disease and/or condition caused by persistence of foreign antigen that lead to exhaustion T cell phenotype characterized by impaired functionality which is manifested as reduced proliferation and cytokine production. As used herein the term “infectious disorder and/or disease” and/or “infection”, further includes any of the below listed infectious disorders, diseases and/or conditions, caused by a bacterial infection, viral infection, fungal infection and/or parasite infection.

As used herein the term “viral infection” comprises any infection caused by a virus, optionally including but not limited to Retroviridae (e.g., human immunodeficiency viruses, such as HIV-1 or HIV-2, acquired immune deficiency (AIDS) also referred to as HTLV-III, LAV or HTLV-III/LAV, or HIV-III; and other isolates, such as HIV-LP; Picornaviridae (e.g., polio viruses, hepatitis A virus; enteroviruses, human coxsackie viruses, rhinoviruses, echoviruses); Calciviridae (e.g., strains that cause gastroenteritis); Togaviridae (e.g., equine encephalitis viruses, rubella viruses); Flaviridae (e.g., dengue viruses, encephalitis viruses, yellow fever viruses); Coronaviridae (e.g., coronaviruses); Rhabdoviridae (e.g., vesicular stomatitis viruses, rabies viruses); Filoviridae (e.g., ebola viruses); Paramyxoviridae (e.g., parainfluenza viruses, mumps virus, measles virus, respiratory syncytial virus); Orthomyxoviridae (e.g., influenza viruses); Bungaviridae (e.g., Hantaan viruses, bunga viruses, phleboviruses and Nairo viruses); Arena viridae (hemorrhagic fever virus); Reoviridae (e.g., reoviruses, orbiviruses and rotaviruses); Birnaviridae; Hepadnaviridae (Hepatitis B virus); Parvoviridae (parvoviruses); Papovaviridae (papilloma viruses, polyoma viruses); Adenoviridae (most adenoviruses); Herperviridae (herpes simplex virus (HSV) 1 and 2, varicella zoster virus, cytomegalovirus (CMV), herpes viruses); Poxviridae (variola viruses, vaccinia viruses, pox viruses); and Iridoviridae (e.g., African swine fever virus); and unclassified viruses (e.g., the etiological agents of Spongiform encephalopathies, the agent of delta hepatitides (thought to be a defective satellite of hepatitis B virus), the agents of non-A, non-B hepatitis (class 1—internally transmitted; class 2—parenterally transmitted (i.e., Hepatitis C); Norwalk and related viruses, and astroviruses) as well as Severe acute respiratory syndrome virus and respiratory syncytial virus (RSV).

As used herein the term “fungal infection” comprises any infection caused by a fungi, optionally including but not limited to Cryptococcus neoformans, Histoplasma capsulatum, Coccidioides immitis, Blastomyces dermatitidis, Chlamydia trachomatis, Candida albicans.

As used herein the term “parasite infection” comprises any infection caused by a parasite, optionally including but not limited to protozoa, such as Amebae, Flagellates, Plasmodium falciparum, Toxoplasma gondii, Ciliates, Coccidia, Microsporidia, Sporozoa; helminthes, Nematodes (Roundworms), Cestodes (Tapeworms), Trematodes (Flukes), Arthropods, and aberrant proteins known as prions.

An infectious disorder and/or disease caused by bacteria may optionally comprise one or more of Sepsis, septic shock, sinusitis, skin infections, pneumonia, bronchitis, meningitis, Bacterial vaginosis, Urinary tract infection (UCI), Bacterial gastroenteritis, Impetigo and erysipelas, Erysipelas, Cellulitis, anthrax, whooping cough, lyme disease, Brucellosis, enteritis, acute enteritis, Tetanus, diphtheria, Pseudomembranous colitis, Gas gangrene, Acute food poisoning, Anaerobic cellulitis, Nosocomial infections, Diarrhea, Meningitis in infants, Traveller's diarrhea, Hemorrhagic colitis, Hemolytic-uremic syndrome, Tularemia, Peptic ulcer, Gastric and Duodenal ulcers, Legionnaire's Disease, Pontiac fever, Leptospirosis, Listeriosis, Leprosy (Hansen's disease), Tuberculosis, Gonorrhea, Ophthalmia neonatorum, Septic arthritis, Meningococcal disease including meningitis, Waterhouse-Friderichsen syndrome, Pseudomonas infection, Rocky mountain spotted fever, Typhoid fever type salmonellosis, Salmonellosis with gastroenteritis and enterocolitis, Bacillary dysentery/Shigellosis, Coagulase-positive staphylococcal infections: Localized skin infections including Diffuse skin infection (Impetigo), Deep localized infections, Acute infective endocarditis, Septicemia, Necrotizing pneumonia, Toxinoses such as Toxic shock syndrome and Staphylococcal food poisoning, Cystitis, Endometritis, Otitis media, Streptococcal pharyngitis, Scarlet fever, Rheumatic fever, Puerperal fever, Necrotizing fasciitis, Cholera, Plague (including Bubonic plague and Pneumonic plague), as well as any infection caused by a bacteria selected from but not limited to Helicobacter pyloris, Boreliai burgdorferi, Legionella pneumophilia, Mycobacteria sps (e.g., M. tuberculosis, M. avium, M. Intracellulare, M. kansaii, M. gordonae), Staphylococcus aureus, Neisseria gonorrhoeae, Neisseria meningitidis, Listeria monocytogenes, Streptococcus pyogenes (Group A Streptococcus), Streptococcus agalactiae (Group B Streptococcus), Streptococcus (viridans group), Streptococcus faecalis, Streptococcus bovis, Streptococcus (anaerobic sps.), Streptococcus pneumoniae, pathogenic Campylobacter sp., Enterococcus sp Haemophilus influenzae, Bacillus antracis, Corynebacterium diphtheriae, corynebacterium sp., Erysipelothrix rhusiopathiae, Clostridium perfringers, Clostridium tetani, Enterobacter erogenes, Klebsiella pneuomiae, Pasteurella multicoda, Bacteroides sp., Fusobacterium nucleatum, Sreptobacillus moniliformis, Treponema pallidium, Treponema pertenue, Leptospira, and Actinomeyces israelli.

Non limiting examples of infectious disorder and/or disease caused by virus is selected from the group consisting of but not limited to acquired immune deficiency (AIDS), West Nile encephalitis, coronavirus infection, rhinovirus infection, influenza, dengue, hemorrhagic fever; an otological infection; severe acute respiratory syndrome (SARS), acute febrile pharyngitis, pharyngoconjunctival fever, epidemic keratoconjunctivitis, infantile gastroenteritis, infectious mononucleosis, Burkitt lymphoma, acute hepatitis, chronic hepatitis, hepatic cirrhosis, hepatocellular carcinoma, primary HSV-1 infection, (gingivostomatitis in children, tonsillitis & pharyngitis in adults, keratoconjunctivitis), latent HSV-1 infection (herpes labialis, cold sores), aseptic meningitis, Cytomegalovirus infection, Cytomegalic inclusion disease, Kaposi sarcoma, Castleman disease, primary effusion lymphoma, influenza, measles, encephalitis, postinfectious encephalomyelitis, Mumps, hyperplastic epithelial lesions (common, flat, plantar and anogenital warts, laryngeal papillomas, epidermodysplasia verruciformis), croup, pneumonia, bronchiolitis, Poliomyelitis, Rabies, bronchiolitis, pneumonia, German measles, congenital rubella, Hemorrhagic Fever, Chickenpox, Dengue, Ebola infection, Echovirus infection, EBV infection, Fifth Disease, Filovirus, Flavivirus, Hand, foot & mouth disease, Herpes Zoster Virus (Shingles), Human Papilloma Virus Associated Epidermal Lesions, Lassa Fever, Lymphocytic choriomeningitis, Parainfluenza Virus Infection, Paramyxovirus, Parvovirus B19 Infection, Picornavirus, Poxviruses infection, Rotavirus diarrhea, Rubella, Rubeola, Varicella, Variola infection.

An infectious disorder and/or disease caused by fungi optionally includes but is not limited to Allergic bronchopulmonary aspergillosis, Aspergilloma, Aspergillosis, Basidiobolomycosis, Blastomycosis, Candidiasis, Chronic pulmonary aspergillosis, Chytridiomycosis, Coccidioidomycosis, Conidiobolomycosis, Covered smut (barley), Cryptococcosis, Dermatophyte, Dermatophytid, Dermatophytosis, Endothrix, Entomopathogenic fungus, Epizootic lymphangitis, Epizootic ulcerative syndrome, Esophageal candidiasis, Exothrix, Fungemia, Histoplasmosis, Lobomycosis, Massospora cicadina, Mycosis, Mycosphaerella fragariae, Myringomycosis, Paracoccidioidomycosis, Pathogenic fungi, Penicilliosis, Thousand cankers disease, Tinea, Zeaspora, Zygomycosis. Non limiting examples of infectious disorder and/or disease caused by parasites is selected from the group consisting of but not limited to Acanthamoeba, Amoebiasis, Ascariasis, Ancylostomiasis, Anisakiasis, Babesiosis, Balantidiasis, Baylisascariasis, Blastocystosis, Candiru, Chagas disease, Clonorchiasis, Cochliomyia, Coccidia, Chinese Liver Fluke Cryptosporidiosis, Dientamoebiasis, Diphyllobothriasis, Dioctophyme renalis infection, Dracunculiasis, Echinococcosis, Elephantiasis, Enterobiasis, Fascioliasis, Fasciolopsiasis, Filariasis, Giardiasis, Gnathostomiasis, Hymenolepiasis, Halzoun Syndrome, Isosporiasis, Katayama fever, Leishmaniasis, lymphatic filariasis, Malaria, Metagonimiasis, Myiasis, Onchocerciasis, Pediculosis, Primary amoebic meningoencephalitis, Parasitic pneumonia, Paragonimiasis, Scabies, Schistosomiasis, Sleeping sickness, Strongyloidiasis, Sparganosis, Rhinosporidiosis, River blindness, Taeniasis (cause of Cysticercosis), Toxocariasis, Toxoplasmosis, Trichinosis, Trichomoniasis, Trichuriasis, Trypanosomiasis, Tapeworm infection.

A preferred example of infectious disease is a disease caused by any of hepatitis B, hepatitis C, infectious mononucleosis, EBV, cytomegalovirus, AIDS, HIV-1, HIV-2, tuberculosis, malaria and schistosomiasis.

As used herein, the term “vaccine” refers to a biological preparation that improves immunity to a particular disease, wherein the vaccine includes an antigen, such as weakened or killed forms of pathogen, its toxins or one of its surface proteins, against which immune responses are elicited. A vaccine typically includes an adjuvant as immune potentiator to stimulate the immune system. As used herein, the term “therapeutic vaccine” and/or “therapeutic vaccination” refers to a vaccine used to treat ongoing disease, such as infectious disease or cancer.

As used herein, the term “adjuvant” refers to an agent used to stimulate the immune system and increase the response to a vaccine, without having any specific antigenic effect in itself.

As used herein, the term LY6G6F and/or LY6G6F protein(s) refers to any one of the proteins set forth in SEQ ID NO:1, and/or variants thereof, and/or orthologs and/or fragments thereof, and/or nucleic acid sequences encoding for same, that are differentially expressed in cancers as recited herein and/or in infectious disorders as recited herein, and/or immune related disorders as recited herein, and/or that play a role in the etiology of cancers, and/or in infectious disorders, and/or immune related disorders.

According to preferred embodiments, a LY6G6F fragment comprises an amino acid sequence of LY6G6F ectodomain, set forth in any one of SEQ ID NOs: 2, 59, 81, 96, and/or variants thereof. According to preferred embodiments, a LY6G6F ortholog comprises any one of SEQ ID NOs:20, 29. According to preferred embodiments, a nucleic acid sequence encoding LY6G6F protein comprises SEQ ID NO:33, 57 or 182.

As used herein, the term VSIG10 and/or VSIG10 protein(s) refers to any one of the proteins set forth in any one of SEQ ID NOs:3, 5, and/or variants thereof, and/or orthologs and/or fragments thereof, and/or nucleic acid sequences encoding for same, that are differentially expressed in cancers as recited herein and/or in infectious disorders as recited herein, and/or immune related disorders as recited herein, and/or that play a role in the etiology of cancers and/or in infectious disorders, and/or immune related disorders.

According to preferred embodiments, a VSIG10 fragment comprises an amino acid sequence of VSIG10 ectodomain, set forth in any one of SEQ ID NOs: 4, 6, 60, 61, 82-93, 97-100, and/or variants thereof, and/or an amino acid sequence comprising a VSIG10 variant (SEQ ID NO:5) unique edge portion, demonstrated in FIG. 2A. According to preferred embodiments, a VSIG10 ortholog comprises any one of SEQ ID NOs: 19, 30. According to preferred embodiments, a nucleic acid sequence encoding VSIG10 protein comprises any one of SEQ ID NOs: 34, 35, 36, 183, or 184.

As used herein, the term TMEM25 and/or TMEM25 protein(s) refers to any one of the proteins set forth in any one of SEQ ID NOs: 7, 39, and/or variants thereof, and/or orthologs and/or fragments thereof, and/or nucleic acid sequences encoding for same, that are differentially expressed in cancers as recited herein and/or in infectious disorders as recited herein, and/or immune related disorders as recited herein, and/or that play a role in the etiology of cancers and/or in infectious disorders, and/or immune related disorders.

According to preferred embodiments, a TMEM25 fragment comprises an amino acid sequence of TMEM25 ectodomain, set forth in any one of SEQ ID NOs: 8, 39, 94, 101 and/or variants thereof. According to preferred embodiments, a TMEM25 ortholog comprises a protein having a sequence according to any of SEQ ID NO: 9, and/or 28. According to preferred embodiments, a nucleic acid sequence encoding TMEM25 protein comprises any one of SEQ ID NOs:37 or 185.

As used herein, the term LSR and/or LSR protein(s) refers to any one of the proteins set forth in any one of SEQ ID NOs: 11, 13, 15-18, 143, and/or variants thereof, and/or orthologs and/or fragments thereof, and/or nucleic acid sequences encoding for same, that are differentially expressed in cancers as recited herein and/or in infectious disorders as recited herein, and/or immune related disorders as recited herein, and/or that play a role in the etiology of cancers and/or in infectious disorders, and/or immune related disorders.

According to preferred embodiments, a LSR fragment comprises an amino acid sequence of LSR ectodomain, set forth in any one of SEQ ID NOs:10, 12, 14, 22, 47-50, 95, 102, and/or variants thereof, and/or an amino acid sequence comprising a LSR variant (SEQ ID NO:18) unique edge portion, demonstrated in FIG. 2G. An example of LSR orthologs is presented in any one of SEQ ID NOs: 21, 31, 32. According to preferred embodiments, a nucleic acid sequence encoding LSR protein comprises any one of SEQ ID NOs: 40-46, 132, 155, 188, 186, 187, 145, 154.

Without wishing to be limited by a single hypothesis, each of the LY6G6F, VSIG10, TMEM25 and/or LSR proteins according to at least some embodiments of the present invention, was predicted to be an immune costimulatory protein, e.g., a B7 protein family member that is involved in B7 immune co-stimulation including for example T cell responses elicited against cancer cells and that elicit effects on immunity such as triggering of autoimmune effects.

As used herein, the term the “soluble ectodomain (ECD)” or “ectodomain” or “soluble LY6G6F, VSIG10, TMEM25 and/or LSR protein(s)/molecule(s)” of LY6G6F, VSIG10, TMEM25 and/or LSR means non-cell-surface-bound (i.e. circulating) LY6G6F, VSIG10, TMEM25 and/or LSR molecules or any portion thereof, including, but not limited to: LY6G6F, VSIG10, TMEM25 and/or LSR-Ig fusion proteins, wherein the extracellular domain of LY6G6F, VSIG10, TMEM25 and/or LSR is fused to an immunoglobulin (Ig) moiety rendering the fusion molecule soluble, or fragments and derivatives thereof, proteins with the extracellular domain of LY6G6F, VSIG10, TMEM25 and/or LSR fused or joined with a portion of a biologically active or chemically active protein such as the papillomavirus E7 gene product, melanoma-associated antigen p97 or HIV env protein, or fragments and derivatives thereof hybrid (chimeric) fusion proteins such as LY6G6F, VSIG10, TMEM25 and/or LSR-Ig, or fragments and derivatives thereof. Such fusion proteins are described in greater detail below.

“Soluble LY6G6F, VSIG10, TMEM25 and/or LSR protein(s)/molecule(s)” also include LY6G6F, VSIG10, TMEM25 and/or LSR molecules with the transmembrane domain removed to render the protein soluble, or fragments and derivatives thereof fragments, portions or derivatives thereof, and soluble LY6G6F, VSIG10, TMEM25 and/or LSR mutant molecules. The soluble LY6G6F, VSIG10, TMEM25 and/or LSR molecules used in the methods according to at least some embodiments of the invention may or may not include a signal (leader) peptide sequence.

Fragments of LY6G6F Polypeptides

The term the “soluble ectodomain (ECD)” or “ectodomain” or “soluble” form of LY6G6F refers also to the nucleic acid sequences encoding the corresponding proteins of LY6G6F “soluble ectodomain (ECD)” or “ectodomain” or “soluble LY6G6F proteins/molecules”). Optionally, the LY6G6F ECD refers to any one of the polypeptide sequences below and/or listed in Table A below, and/or or fragments or variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith, and/or conjugates thereof, and/or polynucleotides encoding same:

SEQ ID NO: 2, amino acid residues 17-234 (not including signal peptide, up till transmembrane) (FIG. 1A): ADNMQAIYVALGEAVELPCPSPPTLHGDEHLSWFCSPAAGS FTTLVAQVQVGRPAPDPGKPGRESRLRLLGNYSLWLEGSKE EDAGRYWCAVLGQHHNYQNWRVYDVLVLKGSQLSARAADGS PCNVLLCSVVPSRRMDSVTWQEGKGPVRGRVQSFWGSEAAL LLVCPGEGLSEPRSRRPRIIRCLMTHNKGVSFSLAASIDAS PALCAPSTGWDMP, and fragments and variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith. SEQ ID NO:59 represents an example of the LY6G6F ECD including signal peptide.

TABLE A SEQ ID NO: Amino acid sequence Description 81 ADNMQAIYVALGEAVELP LY6G6F_IgV_ CPSPPTLHGDEHLSWFCSP domain AAGSFTTLVAQVQVGRPAP aa 17-122 DPGKPGRESRLRLLGNYSL of seq id: 1 WLEGSKEEDAGRYWCAVLG QHHNYQNWRVYD

Optionally, the fragment is of at least about 62, 63, 64, 65 and so forth amino acids of the extracellular domain of LY6G6F protein, set forth in SEQ ID NO: 1, up to 228 amino acids of the LY6G6F protein extracellular domain, optionally including any integral value between 62 and 228 amino acids in length. Preferably, the fragment is of at least about 62 and up to 82 amino acids of the LY6G6F protein extracellular domain, optionally including any integral value between 62 and 82 amino acids in length. Also preferably the fragment is of at least about 95 up to 115 amino acids of the LY6G6F protein extracellular domain, optionally including any integral value between 95 and 115 amino acids in length. Also preferably the fragment is of at least about 208 up to 228 amino acids of the LY6G6F protein extracellular domain, optionally including any integral value between 208 and 228 amino acids in length. More preferably, the fragment is about 72 or 106 or 218 amino acids. The LY6G6F fragment protein according to at least some embodiments of the invention may or may not include a signal peptide sequence, and may or may not include 1, 2, 3, 4, or 5 contiguous amino acids from the LY6G6F transmembrane domain.

In particular, the fragments of the extracellular domain of LY6G6F can include any sequence corresponding to any portion of or comprising the IgV domain of the extracellular domain of LY6G6F, having any sequence corresponding to residues of LY6G6F (SEQ ID NO:1) starting from any position between 14 and 27 and ending at any position between 112 and 132.

The LY6G6F proteins contain an immunoglobulin domain within the extracellular domain, the IgV domain (or V domain), shown in FIG. 1 A in a box, which is related to the variable domain of antibodies. The IgV domain may be responsible for receptor binding, by analogy to the other B7 family members. The Ig domain of the extracellular domain includes one disulfide bond formed between intradomain cystein residues, as is typical for this fold and may be important for structure-function. In SEQ ID NO: 1 these cysteines are located at residues 35 and 106.

In one embodiment, there is provided a soluble fragment of LY6G6F; as described in greater detail below with regard to the section on fusion proteins, such a soluble fragment may optionally be described as a first fusion partner. Useful fragments are those that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. A LY6G6F polypeptide that is a fragment of full-length LY6G6F typically has at least 20 percent, 30 percent, 40 percent, 50 percent, 60 percent, 70 percent, 80 percent, 90 percent, 95 percent, 98 percent, 99 percent, 100 percent, or even more than 100 percent of the ability to bind its natural receptor(s) and/or of the ability to inhibit T cell activation as compared to full-length LY6G6F. Soluble LY6G6F polypeptide fragments are fragments of LY6G6F polypeptides that may be shed, secreted or otherwise extracted from the producing cells. In other embodiments, the soluble fragments of LY6G6F polypeptides include fragments of the LY6G6F extracellular domain that retain LY6G6F biological activity, such as fragments that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. The extracellular domain can include 1, 2, 3, 4, or 5 contiguous amino acids from the transmembrane domain, and/or 1, 2, 3, 4, or 5 contiguous amino acids from the signal sequence. Alternatively, the extracellular domain can have 1, 2, 3, 4, 5 or more amino acids removed from the C-terminus, N-terminus, or both.

In some embodiments the LY6G6F extracellular domain polypeptide comprises the amino acid sequence of the IgV domain as set forth in any one of SEQ ID NO: 81, or fragments or variants thereof, or the region between the conserved cysteines of the IgV domain located at residues 35 and 106 of the full-length protein SEQ ID NO:1, corresponding to the sequence set forth in SEQ ID NO: 96: CPSPPTLHGDEHLSWFCSPAAGSFTTLVAQVQVGRPAPDPGKPGRESRLRLLGNY SLWLEGSKEEDAGRYWC. In other embodiments the LY6G6F extracellular domain polypeptide consists essentially of the amino acid sequence of the IgV domain as set forth in any one of SEQ ID NOs: 81 and 96.

Generally, the LY6G6F polypeptide fragments are expressed from nucleic acids that include sequences that encode a signal sequence. The signal sequence is generally cleaved from the immature polypeptide to produce the mature polypeptide lacking the signal sequence. The signal sequence of LY6G6F can be replaced by the signal sequence of another polypeptide using standard molecule biology techniques to affect the expression levels, secretion, solubility, or other property of the polypeptide. The signal peptide sequence that is used to replace the LY6G6F signal peptide sequence can be any known in the art.

Optionally, the LY6G6F ECD refers to any one of the nucleic acid sequences encoding LY6G6F ECD polypeptides, optionally to the nucleic acid sequences set forth in SEQ ID NO:33, or fragments thereof and/or degenerative variants thereof, encoding LY6G6F ECD polypeptides set forth in SEQ ID NO:2.

Optionally, the LY6G6F ECD refers to orthologous ECD polypeptides. Optionally, the LY6G6F ECD refers to mouse LY6G6F ECD polypeptides, set forth in SEQ ID NOs:20, and/or a mouse LY6G6F ECD-IgG2a-Fc-fused polypeptide, set forth in SEQ ID NOs:23.

Fragments of VSIG10 Polypeptides

The term the “soluble ectodomain (ECD)” or “ectodomain” or “soluble” form of VSIG10 refers also to the nucleic acid sequences encoding the corresponding proteins of VSIG10 “soluble ectodomain (ECD)” or “ectodomain” or “soluble VSIG10 proteins/molecules”). Optionally, the VSIG10 ECD refers to any one of the polypeptide sequences below and/or listed in Table B below, and/or fragments or variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith, and/or conjugates thereof, and/or polynucleotides encoding same:

SEQ ID NO: 4, amino acid residues 31-413 (not including signal peptide, up till transmembrane)(FIG. 1B): VVIGEVHENVTLHCGNISGLRGQVTWYRNNSEPVF LLSSNSSLRPAEPRFSLVDATSLHIESLSLGDEGI YTCQEILNVTQWFQVWLQVASGPYQIEVHIVATGT LPNGTLYAARGSQVDFSCNSSSRPPPVVEWWFQAL NSSSESFGHNLTVNFFSLLLISPNLQGNYTCLALN QLSKRHRKVTTELLVYYPPPSAPQCWAQMASGSFM LQLTCRWDGGYPDPDFLWIEEPGGVIVGKSKLGVE MLSESQLSDGKKFKCVTSHIVGPESGASCMVQIRG PSLLSEPMKTCFTGGNVTLTCQVSGAYPPAKILWL RNLTQPEVIIQPSSRHLITQDGQNSTLTIHNCSQD LDEGYYICRADSPVGVREMEIWLSVKEPLNIGG; SEQ ID NO: 6, amino acid residues 31-312 (skipping exon 3 variant, not including signal peptide, up till transmembrane) (FIG. 1C): VVIGEVHENVTLHCGNISGLRGQVTWYRNNSEPVF LLSSNSSLRPAEPRFSLVDATSLHIESLSLGDEGI YTCQEILNVTQWFQVWLQVANPPPSAPQCWAQMAS GSFMLQLTCRWDGGYPDPDFLWIEEPGGVIVGKSK LGVEMLSESQLSDGKKFKCVTSHIVGPESGASCMV QIRGPSLLSEPMKTCFTGGNVTLTCQVSGAYPPAK ILWLRNLTQPEVIIQPSSRHLITQDGQNSTLTIHN CSQDLDEGYYICRADSPVGVREMEIWLSVKEPLNI GG, and variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith. SEQ ID NOs:60-61 represent examples of the VSIG10 ECD including signal peptide.

TABLE B SEQ ID Amino acid NO: sequence Description 82 VVIGEVHENVTLHCGNISGL VSIG10_IgC2_ RGQVTWYRNNSEPVFLLSSN domain_1 aa SSLRPAEPRFSLVDATSLHI 31-119 of ESLSLGDEGIYTCQEILNVT seq id: 3 QWFQVWLQV aa 31-119 of seq id: 5 83 PYQIEVHIVATGTLPNGTLY VSIG10_IgC2_ AARGSQVDFSCNSSSRPPPV domain_2 VEWWFQALNSSSESFGHNLT aa 123-215 VNFFSLLLISPNLQGNYTCL of ALNQLSKRHRKVT seq id: 3 84 PPPSAPQCWAQMASGSFMLQ VSIG10_IgC2_ LTCRWDGGYPDPDFLWIEEP domain_3 aa GGVIVGKSKLGVEMLSESQL 223-309 of SDGKKFKCVTSHIVGPESGA seq id: 3 SCMVQIR aa 122-208 of seq id: 5 85 PSLLSEPMKTCFTGGNVTLT VSIG10_IgC2_ CQVSGAYPPAKILWLRNLTQ domain_4 PEVIIQPSSRHLITQDGQNS aa 311-404 TLTIHNCSQDLDEGYYICRA of DSPVGVREMEIWLS seq id: 3 aa 210-303 of seq id: 5 86 VVIGEVHENVTLHCGNISGL VSIG10_WT_IgC2_ RGQVTWYRNNSEPVFLLSSN domains_1-2 SSLRPAEPRFSLVDATSLHI aa 31-215 of ESLSLGDEGIYTCQEILNVT seq id: 3 QWFQVWLQVASGPYQIEVHI VATGTLPNGTLYAARGSQVD FSCNSSSRPPPVVEWWFQAL NSSSESFGHNLTVNFFSLLL ISPNLQGNYTCLALNQLSKR HRKVT 87 VVIGEVHENVTLHCGNISGL VSIG10_WT_IgC2_ RGQVTWYRNNSEPVFLLSSN domains_1-3 SSLRPAEPRFSLVDATSLHI aa 31-309 of ESLSLGDEGIYTCQEILNVT seq id: 3 QWFQVWLQVASGPYQIEVHI VATGTLPNGTLYAARGSQVD FSCNSSSRPPPVVEWWFQAL NSSSESFGHNLTVNFFSLLL ISPNLQGNYTCLALNQLSKR HRKVTTELLVYYPPPSAPQC WAQMASGSFMLQLTCRWDGG YPDPDFLWIEEPGGVIVGKS KLGVEMLSESQLSDGKKFKC VTSHIVGPESGASCMVQIR 88 VVIGEVHENVTLHCGNISGL VSIG10_WT_ RGQVTWYRNNSEPVFLLSSN IgC2_domains_ SSLRPAEPRFSLVDATSLHI 1-4 aa 31-404 ESLSLGDEGIYTCQEILNVT of seq id: 3 QWFQVWLQVASGPYQIEVHI VATGTLPNGTLYAARGSQVD FSCNSSSRPPPVVEWWFQAL NSSSESFGHNLTVNFFSLLL ISPNLQGNYTCLALNQLSKR HRKVTTELLVYYPPPSAPQC WAQMASGSFMLQLTCRWDGG YPDPDFLWIEEPGGVIVGKS KLGVEMLSESQLSDGKKFKC VTSHIVGPESGASCMVQIRG PSLLSEPMKTCFTGGNVTLT CQVSGAYPPAKILWLRNLTQ PEVIIQPSSRHLITQDGQNS TLTIHNCSQDLDEGYYICRA DSPVGVREMEIWLS 89 PYQIEVHIVATGTLPNGTLY VSIG10_WT_ AARGSQVDFSCNSSSRPPPV IgC2_domains_ VEWWFQALNSSSESFGHNLT 2-3 aa 123-309 VNFFSLLLISPNLQGNYTCL of seq id: 3 ALNQLSKRHRKVTTELLVYY PPPSAPQCWAQMASGSFMLQ LTCRWDGGYPDPDFLWIEEP GGVIVGKSKLGVEMLSESQL SDGKKFKCVTSHIVGPESGA SCMVQIR 90 PYQIEVHIVATGTLPNGTLY VSIG10_WT_ AARGSQVDFSCNSSSRPPPW IgC2_domains_ EWWFQALNSSSESFGHNLTV 2-4 NFFSLLLISPNLQGNYTCLA aa 123-404 LNQLSKRHRKVTTELLVYYP of seq id: 3 PPSAPQCWAQMASGSFMLQL TCRWDGGYPDPDFLWIEEPG GVIVGKSKLGVEMLSESQLS DGKKFKCVTSHIVGPESGAS CMVQIRGPSLLSEPMKTCFT GGNVTLTCQVSGAYPPAKIL WLRNLTQPEVIIQPSSRHLI TQDGQNSTLTIHNCSQDLDE GYYICRADSPVGVREMEIWL S 91 PPPSAPQCWAQMASGSFMLQ VSIG10_IgC2_ LTCRWDGGYPDPDFLWIEEP domains_3-4 GGVIVGKSKLGVEMLSESQL aa 223-404 SDGKKFKCVTSHIVGPESGA of seq id: 3 SCMVQIRGPSLLSEPMKTCF aa 122-303 TGGNVTLTCQVSGAYPPAKI of seq id: 5 LWLRNLTQPEVIIQPSSRHL ITQDGQNSTLTIHNCSQDLD EGYYICRADSPVGVREMEIW LS 92 VVIGEVHENVTLHCGNISGL VSIG10_Variant_ RGQVTWYRNNSEPVFLLSSN skipping_exon_ SSLRPAEPRFSLVDATSLHI 3_T95617_P6_ ESLSLGDEGIYTCQEILNVT IgC2_domains_1, QWFQVWLQVANPPPSAPQCW 3 aa 31-208 of AQMASGSFMLQLTCRWDGGY seq id: 5 PDPDFLWIEEPGGVIVGKSK LGVEMLSESQLSDGKKFKCV TSHIVGPESGASCMVQIR 93 VVIGEVHENVTLHCGNISGL VSIG10_Variant_ RGQVTWYRNNSEPVFLLSSN skipping_exon_ SSLRPAEPRFSLVDATSLHI 3_T95617_P6_ ESLSLGDEGIYTCQEILNVT IgC2_domains_1, QWFQVWLQVANPPPSAPQCW 3-4 aa 31-303 AQMASGSFMLQLTCRWDGGY of seq id: 5 PDPDFLWIEEPGGVIVGKSK LGVEMLSESQLSDGKKFKCV TSHIVGPESGASCMVQIRGP SLLSEPMKTCFTGGNVTLTC QVSGAYPPAKILWLRNLTQP EVIIQPSSRHLITQDGQNST LTIHNCSQDLDEGYYICRAD SPVGVREMEIWLS

Optionally, the fragment is of at least about 36, 37, 38, 39, 40, 41, 42, 43, and so forth amino acids of the extracellular domain of VSIG10 protein, set forth in SEQ ID NO:3, up to 393 amino acids of the VSIG10 protein extracellular domain, optionally, including any integral value between 36 and 393 amino acids in length. Preferably, the fragment is of at least about 36 up to 70 amino acids of the VSIG10 protein extracellular domain, optionally including any integral value between 36 and 70 amino acids in length. Also preferably the fragment is of at least about 80 up to 100 amino acids of the VSIG10 protein extracellular domain, optionally including any integral value between 80 and 100 amino acids in length. Also preferably the fragment is of at least about 170 up to 200 amino acids of the VSIG10 protein extracellular domain, optionally including any integral value between 170 and 200 amino acids in length. Also preferably the fragment is of at least about 265 up to 290 amino acids of the VSIG10 protein extracellular domain, optionally including any integral value between 265 and 290 amino acids in length. Also preferably the fragment is of at least about 365 up to 393 amino acids of the VSIG10 protein extracellular domain, optionally including any integral value between 365 and 393 amino acids in length. More preferably, the fragment is about 46, 49, 58, 60, 87, 89, 93, 94, 178, 182, 185, 187, 273, 279, 282, 374, 383 amino acids. The VSIG10 fragment protein according to at least some embodiments of the invention may or may not include a signal peptide sequence, and may or may not include 1, 2, 3, 4, or 5 contiguous amino acids from the VSIG10 transmembrane domain.

In particular, the fragments of the extracellular domain of VSIG10 can include any sequence corresponding to any portion of or comprising of one or more of the IgC2 domains of the extracellular domain of VSIG10, having any sequence corresponding to residues of VSIG10 (SEQ ID NO:3) starting from any position between 28 and 41 and ending at any position between 109 and 122 or starting from any position between 120 and 133 and ending at any position between 205 and 222 or starting from any position between 216 and 233 and ending at any position between 299 and 310 or starting from any position between 310 and 321 and ending at any position between 394 and 414 or starting from any position between 28 and 41 and ending at any position between 205 and 222 or starting from any position between 28 and 41 and ending at any position between 299 and 310 or starting from any position between 28 and 41 and ending at any position between 394 and 414 or starting from any position between 120 and 133 and ending at any position between 299 and 310 or starting from any position between 120 and 133 and ending at any position between 394 and 414 or starting from any position between 216 and 233 and ending at any position between 394 and 414, or having any sequence corresponding to residues of VSIG10_Variant_skipping_exon_3_T95617_P6 (SEQ ID NO:5) starting from any position between 28 and 41 and ending at any position between 198 and 209 or starting from any position between 28 and 41 and ending at any position between 293 and 313.

The VSIG10 proteins contain immunoglobulin domains within the extracellular domain, IgC2 domain (or Ig-like C2 domain or Ig C2-set domain), which is related to the constant domain of antibodies. The domains are illustrated in FIG. 1B (for SEQ ID NO:3) and in FIG. 1C (for SEQ ID NO:5). The Ig domains of the extracellular domain include one disulfide bond formed between intradomain cystein residues, as is typical for this fold and may be important for structure-function. In SEQ ID NO: 3 these cysteines are located at residues 44 and 103 and at residues 153 and 201 and at residues 245 and 290 and at residues 331 and 388. In SEQ ID NO:5 these cysteines are located at residues 44 and 103 and 144 and 189 and at residues 230 and 287.

In one embodiment, there is provided a soluble fragment of VSIG10, which may optionally be described as a first fusion partner in the below section on fusion proteins. Useful fragments are those that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. A VSIG10 polypeptide that is a fragment of full-length VSIG10 typically has at least 20 percent, 30 percent, 40 percent, 50 percent, 60 percent, 70 percent, 80 percent, 90 percent, 95 percent, 98 percent, 99 percent, 100 percent, or even more than 100 percent of the ability to bind its natural receptor(s) and/or of the ability to inhibit T cell activation as compared to full-length VSIG10. Soluble VSIG10 polypeptide fragments are fragments of VSIG10 polypeptides that may be shed, secreted or otherwise extracted from the producing cells. In other embodiments, the soluble fragments of VSIG10 polypeptides include fragments of the VSIG10 extracellular domain that retain VSIG10 biological activity, such as fragments that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. The extracellular domain can include 1, 2, 3, 4, or 5 contiguous amino acids from the transmembrane domain, and/or 1, 2, 3, 4, or 5 contiguous amino acids from the signal sequence. Alternatively, the extracellular domain can have 1, 2, 3, 4, 5 or more amino acids removed from the C-terminus, N-terminus, or both.

In some embodiments the VSIG10 extracellular domain polypeptide comprises the amino acid sequence of at least one of the IgC2 domains as set forth in any one of SEQ IDS NO: 82, 83, 84 and 85, or fragments or variants thereof, or the regions between the conserved cysteines of the IgC2 domains located at residues 44 and 103 of the full-length protein SEQ ID NO:3, corresponding to the sequence set forth in SEQ ID NO: 97: CGNISGLRGQVTWYRNNSEPVFLLSSNSSLRPAEPRFSLVDATSLHIESLSLGDEGI YTC, or located at residues 153 and 201 of the full-length protein SEQ ID NO:3, corresponding to the sequence set forth in SEQ ID NO: 98: CNSSSRPPPVVEWWFQALNSSSESFGHNLTVNFFSLLLISPNLQGNYTC or located at residues 245 and 209 of the full-length protein SEQ ID NO:3, corresponding to the sequence set forth in SEQ ID NO: 99: CRWDGGYPDPDFLWIEEPGGVIVGKSKLGVEMLSESQLSDGKKFKC or located at residues 331 and 388 of the full-length protein SEQ ID NO:3, corresponding to the sequence set forth in SEQ ID NO: 100: CQVSGAYPPAKILWLRNLTQPEVIIQPSSRHLITQDGQNSTLTIHNCSQDLDEGYYI C. In some further embodiments the VSIG10 extracellular domain polypeptide consists essentially of amino acid sequence of at least one of SEQ IDS NOs: 82-93, 97-100.

Generally, the VSIG10 polypeptide fragments are expressed from nucleic acids that include sequences that encode a signal sequence. The signal sequence is generally cleaved from the immature polypeptide to produce the mature polypeptide lacking the signal sequence. The signal sequence of VSIG10 can be replaced by the signal sequence of another polypeptide using standard molecule biology techniques to affect the expression levels, secretion, solubility, or other property of the polypeptide. The signal peptide sequence that is used to replace the VSIG10 signal peptide sequence can be any known in the art.

Optionally, the VSIG10 ECD refers also to any one of the nucleic acid sequences encoding VSIG10 ECD polypeptides, optionally to the nucleic acid sequences set forth in SEQ ID NOs:34, 36, or fragments thereof and/or degenerative variants thereof, encoding VSIG10 ECD polypeptides set forth in SEQ ID NOs:4, 6, respectively.

Optionally, the VSIG10 ECD refers to orthologous ECD polypeptides. Optionally, the VSIG10 ECD refers to mouse VSIG10 ECD polypeptides, set forth in SEQ ID NO:19, and/or a mouse VSIG10 ECD-IgG2a-Fc-fused polypeptide, set forth in SEQ ID NO:24.

Fragments of TMEM25 Polypeptides

The term the “soluble ectodomain (ECD)” or “ectodomain” or “soluble” form of TMEM25 refers also to the nucleic acid sequences encoding the corresponding proteins of TMEM25 “soluble ectodomain (ECD)” or “ectodomain” or “soluble TMEM25 proteins/molecules”). Optionally, the TMEM25 ECD refers to any one of the polypeptide sequences below and/or listed in Table C below, and/or fragments or variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith, and/or conjugates thereof, and/or polynucleotides encoding same:

SEQ ID NO: 8, amino acid residues 27-232 (not including signal peptide, up till transmembrane) (FIG. 1D): ELEPQIDGQTWAERALRENERHAFTCRVAGGPGTP RLAWYLDGQLQEASTSRLLSVGGEAFSGGTSTFTV TAHRAQHELNCSLQDPRSGRSANASVILNVQFKPE IAQVGAKYQEAQGPGLLVVLFALVRANPPANVTWI DQDGPVTVNTSDFLVLDAQNYPWLTNHTVQLQLRS LAHNLSVVATNDVGVTSASLPAPGLLATRVE, and variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith. SEQ ID NO:39 represents example of the TMEM25 ECD including signal peptide.

TABLE C SEQ ID Amino NO: acid sequence Description 94 PQIDGQTWAERALRENE TMEM25_IgC2_ RHAFTCRVAGGPGTPRLAWYL domain aa DGQLQEASTSRLLSVGGEAFS 30-123 of GGTSTFTVTAHRAQHELNCSL seq id: 7 QDPRSGRSANASVI

Optionally, the fragment is of at least about 46, 47, 48, 49, 50, 51, 52, and so forth amino acids of the extracellular domain of TMEM25 protein, set forth in SEQ ID NO:7, up to 216 amino acids of the TMEM25 protein extracellular domain, optionally including any integral value between 46 and 216 amino acids in length. Preferably, the fragment is of at least about 46 up to 66 amino acids of the TMEM25 protein extracellular domain, optionally including any integral value between 46 and 66 amino acids in length. Also preferably the fragment is of at least about 84 up to 104 amino acids of the TMEM25 protein extracellular domain, optionally including any integral value between 84 and 104 amino acids in length. Also preferably the fragment is of at least about 196 up to 216 amino acids of the TMEM25 protein extracellular domain, optionally including any integral value between 196 and 216 amino acids in length. More preferably, the fragment is about 56 or 94 or 206 amino acids. The TMEM25 fragment protein according to at least some embodiments of the invention may or may not include a signal peptide sequence, and may or may not include 1, 2, 3, 4, or 5 contiguous amino acids from the TMEM25 transmembrane domain.

In particular, the fragments of the extracellular domain of TMEM25 can include any sequence corresponding to any portion of or comprising the IgC2 domain of the extracellular domain of TMEM25, having any sequence corresponding to residues of TMEM25 (SEQ ID NO:7) starting from any position between 27 and 40 and ending at any position between 113 and 133.

The TMEM25 proteins contain an immunoglobulin domain within the extracellular domain, IgC2 domain (or Ig-like C2 domain or Ig C2-set domain), which is related to the constant domain of antibodies. The domain is shown in FIG. 1D in a box. The Ig domain of the extracellular domain includes one disulfide bond formed between intradomain cystein residues, as is typical for this fold and may be important for structure-function. In SEQ ID NO: 7 these cysteines are located at residues 52 and 107.

In one embodiment, there is provided a soluble fragment of TMEM25, which may optionally be described as a first fusion partner, as for example in the detailed section on fusion proteins below. Useful fragments are those that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. A TMEM25 polypeptide that is a fragment of full-length TMEM25 typically has at least 20 percent, 30 percent, 40 percent, 50 percent, 60 percent, 70 percent, 80 percent, 90 percent, 95 percent, 98 percent, 99 percent, 100 percent, or even more than 100 percent of the ability to bind its natural receptor(s) and/or of the ability to inhibit T cell activation as compared to full-length TMEM25. Soluble TMEM25 polypeptide fragments are fragments of TMEM25 polypeptides that may be shed, secreted or otherwise extracted from the producing cells. In other embodiments, the soluble fragments of TMEM25 polypeptides include fragments of the TMEM25 extracellular domain that retain TMEM25 biological activity, such as fragments that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. The extracellular domain can include 1, 2, 3, 4, or 5 contiguous amino acids from the transmembrane domain, and/or 1, 2, 3, 4, or 5 contiguous amino acids from the signal sequence. Alternatively, the extracellular domain can have 1, 2, 3, 4, 5 or more amino acids removed from the C-terminus, N-terminus, or both.

In some embodiments the TMEM25 extracellular domain polypeptide comprises the amino acid sequence of IgC2 domain, as set forth in any one of SEQ ID NO: 94, or fragments or variants thereof, or the region between the conserved cysteines of the IgC2 domain located at residues 52 and 107 of the full-length protein SEQ ID NO:7, corresponding to the sequence set forth in SEQ ID NO: 101: CRVAGGPGTPRLAWYLDGQLQEASTSRLLSVGGEAFSGGTSTFTVTAHRAQHEL NC. In other embodiments the TMEM25 extracellular domain polypeptide consists essentially of the amino acid sequence of the IgC2 domain as set forth in any one of SEQ ID NOs: 94 and 101.

Generally, the TMEM25 polypeptide fragments are expressed from nucleic acids that include sequences that encode a signal sequence. The signal sequence is generally cleaved from the immature polypeptide to produce the mature polypeptide lacking the signal sequence. The signal sequence of TMEM25 can be replaced by the signal sequence of another polypeptide using standard molecule biology techniques to affect the expression levels, secretion, solubility, or other property of the polypeptide. The signal peptide sequence that is used to replace the TMEM25 signal peptide sequence can be any known in the art.

Optionally, the TMEM25 ECD refers also to any one of the nucleic acid sequences encoding TMEM25 ECD polypeptides, optionally to the nucleic acid sequences set forth in SEQ ID NO:37, or fragments thereof and/or degenerative variants thereof, encoding TMEM25 ECD polypeptides set forth in SEQ ID NO:8

Optionally, the TMEM25 ECD refers to orthologous ECD polypeptides. Optionally, the TMEM25 ECD refers to mouse TMEM25 ECD polypeptides, set forth in SEQ ID NOs:9, and/or a mouse TMEM25 ECD-IgG2a-Fc-fused polypeptide, set forth in SEQ ID NOs:25.

Fragments of LSR Polypeptides

The term the “soluble ectodomain (ECD)” or “ectodomain” or “soluble” form of LSR refers also to the nucleic acid sequences encoding the corresponding proteins of LSR “soluble ectodomain (ECD)” or “ectodomain” or “soluble LSR proteins/molecules”). Optionally, the LSR ECD refers to any one of the polypeptide sequences below and/or listed in Table D below, and/or fragments or variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith, and/or conjugates thereof, and/or polynucleotides encoding same:

SEQ ID NO: 12, LSR isoform A ECD (not including signal peptide, up till transmembrane) amino acid residues 42-211 (FIG. IE): IQVTVSNPYHVVILFQPVTLPCTYQMTSTPTQPIV IWKYKSFCRDRIADAFSPASVDNQLNAQLAAGNPG YNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRR ITITGNADLTFDQTAWGDSGVYYCSVVSAQDLQGN NEAYAELIVLGRTSGVAELLPGFQAGPIED; SEQ ID NO: 14, LSR isoform B ECD (not including signal peptide, up till transmembrane) amino acid residues 42-192 (FIG. 1F): IQVTVSNPYHVVILFQPVTLPCTYQMTSTPTQPIV IWKYKSFCRDRIADAFSPASVDNQLNAQLAAGNPG YNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRR ITITGNADLTFDQTAWGDSGVYYCSVVSAQDLQGN NEAYAELIVLD; SEQ ID NO: 47, LSR isoform C secreted variant amino acid residues 42-533 (FIG. 1G): IQVTVSNPYHVVILFQPVTLPCTYQMTSTPTQPIV IWKYKSFCRDRIADAFSPASVDNQLNAQLAAGNPG YNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRR ITITGNADLTFDQTAWGDSGVYYCSVVSAQDLQGN NEAYAELIVLVYAAGKAATSGVPSIYAPSTYAHLS PAKTPPPPAMIPMGPAYNGYPGGYPGDVDRSSSAG GQGSYVPLLRDTDSSVASEVRSGYRIQASQQDDSM RVLYYMEKELANFDPSRPGPPSGRVERAMSEVTSL HEDDWRSRPSRGPALTPIRDEEWGGHSPRSPRGWD QEPAREQAGGGWRARRPRARSVDALDDLTPPSTAE SGSRSPTSNGGRSRAYMPPRSRSRDDLYDQDDSRD FPRSRDPHYDDFRSRERPPADPRSHHHRTRDPRDN GSRSGDLPYDGRLLEEAVRKKGSEERRRPHKEEEE EAYYPPAPPPYSETDSQASRERRLKKNLALSRESL VV; SEQ ID NO: 48, LSR isoform D secreted variant amino acid residues 42-532 (FIG. 1H) IQVTVSNPYHVVILFQPVTLPCTYQMTSTPTQPIV IWKYKSFCRDRIADAFSPASVDNQLNAQLAAGNPG YNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRR ITITGNADLTFDQTAWGDSGVYYCSVVSAQDLQGN NEAYAELIVLVYAAGKAATSGVPSIYAPSTYAHLS PAKTPPPPAMIPMGPAYNGYPGGYPGDVDRSSSAG GQGSYVPLLRDTDSSVASVRSGYRIQASQQDDSMR VLYYMEKELANFDPSRPGPPSGRVERAMSEVTSLH EDDWRSRPSRGPALTPIRDEEWGGHSPRSPRGWDQ EPAREQAGGGWRARRPRARSVDALDDLTPPSTAES GSRSPTSNGGRSRAYMPPRSRSRDDLYDQDDSRDF PRSRDPHYDDFRSRERPPADPRSHHHRTRDPRDNG SRSGDLPYDGRLLEEAVRKKGSEERRRPHKEEEEE AYYPPAPPPYSETDSQASRERRLKKNLALSRESLV V; SEQ ID NO: 49, LSR isoform E secreted variant amino acid residues 42-493 (FIG. 1I): IQVTVSNPYHVVILFQPVTLPCTYQMTSTPTQPIV IWKYKSFCRDRIADAFSPASVDNQLNAQLAAGNPG YNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRR ITITGMYAAGKAATSGVPSIYAPSTYAHLSPAKTP PPPAMIPMGPAYNGYPGGYPGDVDRSSSAGGQGSY VPLLRDTDSSVASEVRSGYRIQASQQDDSMRVLYY MEKELANFDPSRPGPPSGRVERAMSEVTSLHEDDW RSRPSRGPALTPIRDEEWGGHSPRSPRGWDQEPAR EQAGGGWRARRPRARSVDALDDLTPPSTAESGSRS PTSNGGRSRAYMPPRSRSRDDLYDQDDSRDFPRSR DPHYDDFRSRERPPADPRSHHHRTRDPRDNGSRSG DLPYDGRLLEEAVRKKGSEERRRPHKEEEEEAYYP PAPPPYSETDSQASRERRLKKNLALSRESLVV; SEQ ID NO: 50, LSR isoform F secreted variant amino acid residues 42-552 (FIG. 1J): IQVTVSNPYHVVILFQPVTLPCTYQMTSTPTQPIV IWKYKSFCRDRIADAFSPASVDNQLNAQLAAGNPG YNPYVECQDSVRTVRVVATKQGNAVTLGDYYQGRR ITITGNADLTFDQTAWGDSGVYYCSVVSAQDLQGN NEAYAELIVLGRTSGVAELLPGFQAGPIEVYAAGK AATSGVPSIYAPSTYAHLSPAKTPPPPAMIPMGPA YNGYPGGYPGDVDRSSSAGGQGSYVPLLRDTDSSV ASEVRSGYRIQASQQDDSMRVLYYMEKELANFDPS RPGPPSGRVERAMSEVTSLHEDDWRSRPSRGPALT PIRDEEWGGHSPRSPRGWDQEPAREQAGGGWRARR PRARSVDALDDLTPPSTAESGSRSPTSNGGRSRAY MPPRSRSRDDLYDQDDSRDFPRSRDPHYDDFRSRE RPPADPRSHHHRTRDPRDNGSRSGDLPYDGRLLEE AVRKKGSEERRRPHKEEEEEAYYPPAPPPYSETDS QASRERRLKKNLALSRESLVV,

and variants thereof possessing at least 80% sequence identity, more preferably at least 90% sequence identity therewith and even more preferably at least 95, 96, 97, 98 or 99% sequence identity therewith. SEQ ID NOs:10, 22 represent example of the LSR ECD including signal peptide.

Optionally, the fragment is of at least about 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110 and so forth amino acids of the extracellular domain of LSR protein, set forth in SEQ ID NO:11 and/or 143, up to 198 amino acids of the extracellular domain, optionally including any integral value between 100 and 198 amino acids in length. The LSR fragment protein according to at least some embodiments of the invention may or may not include a signal peptide sequence, and may or may not include 1, 2, 3, 4, or 5 contiguous amino acids from the LSR transmembrane domain.

TABLE D SEQ ID Amino acid NO: sequence Description 95 IQVTVSNPYHVVILFQPVT LSR_IgV_domain LPCTYQMTSTPTQPIVI aa 42-186 of WKYKSFCRDRIADAFSP seq id: 11, 13, ASVDNQLNAQLAAGNPG 15, 16, YNPYVECQDSVRTVRVV 17, 18 ATKQGNAVTLGDYYQGR RITITGNADLTFDQTAW GDSGVYYCSVVSAQDLQ GNNEAYA

Optionally, the fragment is of at least about 98, 99, 100, 101, 102 and so forth amino acids of the extracellular domain of LSR protein, set forth in SEQ ID NO: 11, up to 180 amino acids of the LY6G6F protein extracellular domain, optionally including any integral value between 98 and 180 amino acids in length Preferably, the fragment is of at least about 98 up to 118 amino acids of the LSR protein extracellular domain, optionally including any integral value between 98 and 118 amino acids in length. Also preferably the fragment is of at least about 135 up to 155 amino acids of the LSR protein extracellular domain, optionally including any integral value between 135 and 155 amino acids in length. Also preferably the fragment is of at least about 160 up to 180 amino acids of the LSR protein extracellular domain, optionally including any integral value between 160 and 180 amino acids in length. More preferably, the fragment is about 108 or 145 or 170 amino acids. The LSR fragment protein according to at least some embodiments of the invention may or may not include a signal peptide sequence, and may or may not include 1, 2, 3, 4, or 5 contiguous amino acids from the LSR transmembrane domain.

The LSR proteins contain an immunoglobulin domain within the extracellular domain, the IgV domain (or V domain), which is related to the variable domain of antibodies. The Ig domain is shown in a box in FIGS. 1E, 1F, 1G, 1H, and 1J, for SEQ ID NOs: 11, 13, 15, 16, and 18, respectively. The Ig domain of the extracellular domain includes one disulfide bond formed between intradomain cystein residues, as is typical for this fold and may be important for structure-function. In SEQ ID NO: 11 these cysteines are located at residues 63 and 170.

In one embodiment, there is provided a soluble fragment of LSR, which may optionally be described as a first fusion partner, as for example in the below section on fusion proteins. Useful fragments are those that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. A LSR polypeptide that is a fragment of full-length LSR typically has at least 20 percent, 30 percent, 40 percent, 50 percent, 60 percent, 70 percent, 80 percent, 90 percent, 95 percent, 98 percent, 99 percent, 100 percent, or even more than 100 percent of the ability to bind its natural receptor(s) and/or of the ability to inhibit T cell activation as compared to full-length LSR. Soluble LSR polypeptide fragments are fragments of LSR polypeptides that may be shed, secreted or otherwise extracted from the producing cells. In other embodiments, the soluble fragments of LSR polypeptides include fragments of the LSR extracellular domain that retain LSR biological activity, such as fragments that retain the ability to bind to their natural receptor or receptors and/or retain the ability to inhibit T cell activation. The extracellular domain can include 1, 2, 3, 4, or 5 contiguous amino acids from the transmembrane domain, and/or 1, 2, 3, 4, or 5 contiguous amino acids from the signal sequence. Alternatively, the extracellular domain can have 1, 2, 3, 4, 5 or more amino acids removed from the C-terminus, N-terminus, or both.

In some embodiments the LSR extracellular domain polypeptide comprises the amino acid of the IgV domain as set forth in any one of SEQ ID NO: 95, or fragments or variants thereof, or the region between the conserved cysteines of the IgV domain located at residues 63 and 170 of the full-length protein SEQ ID NO:11, corresponding to the sequence set forth in SEQ ID NO: 102: CTYQMTSTPTQPIVIWKYKSFCRDRIADAFSPASVDNQLNAQLAAGNPGYNPYVE CQDSVRTVRVVATKQGNAVTLGDYYQGRRITITGNADLTFDQTAWGDSGVYYC. In some further embodiments the LSR extracellular domain polypeptide consists essentially of the amino acid of the IgV domain as set forth in any one of SEQ ID NO: 95, and SEQ ID NO: 102.

Generally, the LSR polypeptide fragments are expressed from nucleic acids that include sequences that encode a signal sequence. The signal sequence is generally cleaved from the immature polypeptide to produce the mature polypeptide lacking the signal sequence. The signal sequence of LSR can be replaced by the signal sequence of another polypeptide using standard molecule biology techniques to affect the expression levels, secretion, solubility, or other property of the polypeptide. The signal peptide sequence that is used to replace the LSR signal peptide sequence can be any known in the art.

Optionally, the LSR ECD refers also to any one of the nucleic acid sequences encoding LSR ECD polypeptides, optionally to the nucleic acid sequences set forth in SEQ ID NO:40, 41, 132, 44, 155, 188, or fragments thereof and/or degenerative variants thereof, encoding LSR ECD polypeptides set forth in any one of SEQ ID NO:12, 14, 47, 48, 49, 50, respectively.

Optionally, the LSR ECD refers to orthologous ECD polypeptides. Optionally, the LSR ECD refers to mouse LSR ECD polypeptides, set forth in SEQ ID NOs:21, and/or a mouse LSR ECD-IgG2a-Fc-fused polypeptide, set forth in SEQ ID NOs:26.

Variants of LY6G6F, VSIG10, TMEM25 and/or LSR Polypeptides

The present invention encompasses useful variants of LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides including those that increase biological activity, as indicated by any of the assays described herein, or that increase half life or stability of the protein. Soluble LY6G6F, VSIG10, TMEM25 and/or LSR proteins or fragments, or fusions thereof having LY6G6F, VSIG10, TMEM25 and/or LSR proteins activity, respectively, can be engineered to increase biological activity. In a further embodiment, the LY6G6F, VSIG10, TMEM25 and/or LSR proteins or fusion protein is modified with at least one amino acid substitution, deletion, or insertion that increases the binding of the molecule to an immune cell, for example a T cell, and transmits an inhibitory signal into the T cell.

Other optional variants are those LY6G6F, VSIG10, TMEM25 and/or LSR proteins that are engineered to selectively bind to one type of T cell versus other immune cells. For example, the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide can be engineered to bind optionally to Tregs, Th0, Th1, Th17, Th2 or Th22 cells. Preferential binding refers to binding that is at least 10%, 20%, 30%, 40%, 50%, 60% f 70%, 80%, 90%, 95%, or greater for one type of cell over another type of cell.

Still other variants of LY6G6F, VSIG10, TMEM25 and/or LSR protein can be engineered to have reduced binding to immune cells relative to wildtype LY6G6F, VSIG10, TMEM25 and/or LSR protein, respectively. These variants can be used in combination with variants having stronger binding properties to modulate the immune response with a moderate impact.

Also optionally, variant LY6G6F, VSIG10, TMEM25 and/or LSR protein can be engineered to have an increased half-life relative to wildtype. These variants typically are modified to resist enzymatic degradation. Exemplary modifications include modified amino acid residues and modified peptide bonds that resist enzymatic degradation. Various modifications to achieve this are known in the art.

The LY6G6F protein (SEQ ID NO:1) also has the following non-silent SNPs (Single Nucleotide Polymorphism) as listed in Table E, (given according to their position(s) on the amino acid sequence, with the alternative amino acid listed the presence of SNPs in LY6G6F protein (SEQ ID NO:1) sequence provides support for alternative sequence(s) of this protein according to the present invention. SEQ ID NO:58 is an example of such a alternative sequence, with alternative amino-acids, using part of the SNPs below

TABLE E Amino acid mutations SNP position(s) on Alternative amino amino acid sequence acid(s)  34 P −> Q  39 P −> S 107 A −> T 167 R −> K

The LSR protein (SEQ ID NO:11) also has the following non-silent SNPs (Single Nucleotide Polymorphism) as listed in Table F, (given according to their position(s) on the amino acid sequence, with the alternative amino acid listed; the presence of SNPs in LSR protein (SEQ ID NO:11) sequence provides support for alternative sequence(s) of this protein according to the present invention. SEQ ID NO:143 is an example of such a alternative sequence, with alternative amino-acids, using part of the SNPs below

TABLE F Amino acid mutations SNP position(s) on amino acid sequence Alternative amino acid(s) 209 I -> M 211 D -> G 260 L -> R 315 S -> N 382 A -> G 591 N -> D

The VSIG10 protein (SEQ ID NO:3) also has the following non-silent SNPs (Single Nucleotide Polymorphism) as listed in Table G, (given according to their position(s) on the amino acid sequence, with the alternative amino acid listed; the presence of SNPs in VSIG10 protein (SEQ ID NO:3) sequence provides support for alternative sequence(s) of this protein according to the present invention.

TABLE G Amino acid mutations SNP position(s) on amino acid sequence Alternative amino acid(s) 333 V -> M 435 H -> Y

The TMEM25 protein (SEQ ID NO:7) also has the following non-silent SNPs (Single Nucleotide Polymorphism) as listed in Table H, (given according to their position(s) on the amino acid sequence, with the alternative amino acid listed; the presence of SNPs in TMEM25 protein (SEQ ID NO:7) sequence provides support for alternative sequence(s) of this protein according to the present invention.

TABLE H Amino acid mutations SNP position(s) on amino acid sequence Alternative amino acid(s) 25 W -> C 342 Q -> R

Various aspects of the invention are described in further detail in the following subsections.

Nucleic Acids

A “nucleic acid fragment” or an “oligonucleotide” or a “polynucleotide” are used herein interchangeably to refer to a polymer of nucleic acid residues. A polynucleotide sequence of the present invention refers to a single or double stranded nucleic acid sequences which is isolated and provided in the form of an RNA sequence, a complementary polynucleotide sequence (cDNA), a genomic polynucleotide sequence and/or a composite polynucleotide sequences (e.g., a combination of the above).

Thus, the present invention encompasses nucleic acid sequences described hereinabove; fragments thereof, sequences hybridizable therewith, sequences homologous thereto [e.g., at least 90%, at least 95, 96, 97, 98 or 99% or more identical to the nucleic acid sequences set forth herein], sequences encoding similar polypeptides with different codon usage, altered sequences characterized by mutations, such as deletion, insertion or substitution of one or more nucleotides, either naturally occurring or man induced, either randomly or in a targeted fashion. The present invention also encompasses homologous nucleic acid sequences (i.e., which form a part of a polynucleotide sequence of the present invention), which include sequence regions unique to the polynucleotides of the present invention.

Thus, the present invention also encompasses polypeptides encoded by the polynucleotide sequences of the present invention. The present invention also encompasses homologues of these polypeptides, such homologues can be at least 90%, at least 95, 96, 97, 98 or 99% or more homologous to the amino acid sequences set forth below, as can be determined using BlastP software of the National Center of Biotechnology Information (NCBI) using default parameters. As mentioned hereinabove, biomolecular sequences of the present invention can be efficiently utilized as tissue or pathological markers and as putative drugs or drug targets for treating or preventing a disease.

Oligonucleotides designed for carrying out the methods of the present invention for any of the sequences provided herein (designed as described above) can be generated according to any oligonucleotide synthesis method known in the art such as enzymatic synthesis or solid phase synthesis. Oligonucleotides used according to this aspect of the present invention are those having a length selected from a range of about 10 to about 200 bases preferably about 15 to about 150 bases, more preferably about 20 to about 100 bases, most preferably about 20 to about 50 bases.

The oligonucleotides of the present invention may comprise heterocyclic nucleosides consisting of purines and the pyrimidines bases, bonded in a 3′ to 5′ phosphodiester linkage.

Preferable oligonucleotides are those modified in either backbone, internucleoside linkages or bases, as is broadly described hereinunder. Such modifications can oftentimes facilitate oligonucleotide uptake and resistivity to intracellular conditions.

Specific examples of preferred oligonucleotides useful according to this aspect of the present invention include oligonucleotides containing modified backbones or non-natural internucleoside linkages. Oligonucleotides having modified backbones include those that retain a phosphorus atom in the backbone, as disclosed in U.S. Pat. Nos. 4,469,863; 4,476,301; 5,023,243; 5,177,196; 5,188,897; 5,264,423; 5,276,019; 5,278,302; 5,286,717; 5,321,131; 5,399,676; 5,405,939; 5,453,496; 5,455,233; 5,466, 677; 5,476,925; 5,519,126; 5,536,821; 5,541,306; 5,550,111; 5,563,253; 5,571,799; 5,587,361; and 5,625,050.

Preferred modified oligonucleotide backbones include, for example, phosphorothioates, chiral phosphorothioates, phosphorodithioates, phosphotriesters, aminoalkyl phosphotriesters, methyl and other alkyl phosphonates including 3′-alkylene phosphonates and chiral phosphonates, phosphinates, phosphoramidates including 3′-amino phosphoramidate and aminoalkylphosphoramidates, thionophosphoramidates, thionoalkylphosphonates, thionoalkylphosphotriesters, and boranophosphates having normal 3′-5′ linkages, 2′-5′ linked analogs of these, and those having inverted polarity wherein the adjacent pairs of nucleoside units are linked 3′-5′ to 5′-3′ or 2′-5′ to 5′-2′. Various salts, mixed salts and free acid forms can also be used.

Alternatively, modified oligonucleotide backbones that do not include a phosphorus atom therein have backbones that are formed by short chain alkyl or cycloalkyl internucleoside linkages, mixed heteroatom and alkyl or cycloalkyl internucleoside linkages, or one or more short chain heteroatomic or heterocyclic internucleoside linkages. These include those having morpholino linkages (formed in part from the sugar portion of a nucleoside); siloxane backbones; sulfide, sulfoxide and sulfone backbones; formacetyl and thioformacetyl backbones; methylene formacetyl and thioformacetyl backbones; alkene containing backbones; sulfamate backbones; methyleneimino and methylenehydrazino backbones; sulfonate and sulfonamide backbones; amide backbones; and others having mixed N, O, S and CH2 component parts, as disclosed in U.S. Pat. Nos. 5,034,506; 5,166,315; 5,185,444; 5,214,134; 5,216,141; 5,235,033; 5,264,562; 5,264,564; 5,405,938; 5,434,257; 5,466,677; 5,470,967; 5,489,677; 5,541,307; 5,561,225; 5,596,086; 5,602,240; 5,610,289; 5,602,240; 5,608,046; 5,610,289; 5,618,704; 5,623,070; 5,663,312; 5,633,360; 5,677,437; and 5,677,439.

Other oligonucleotides which can be used according to the present invention, are those modified in both sugar and the internucleoside linkage, i.e., the backbone, of the nucleotide units are replaced with novel groups. The base units are maintained for complementation with the appropriate polynucleotide target. An example for such an oligonucleotide mimetic, includes peptide nucleic acid (PNA). A PNA oligonucleotide refers to an oligonucleotide where the sugar-backbone is replaced with an amide containing backbone, in particular an aminoethylglycine backbone. The bases are retained and are bound directly or indirectly to aza nitrogen atoms of the amide portion of the backbone. United States patents that teach the preparation of PNA compounds include, but are not limited to, U.S. Pat. Nos. 5,539,082; 5,714,331; and 5,719,262, each of which is herein incorporated by reference. Other backbone modifications, which can be used in the present invention are disclosed in U.S. Pat. No. 6,303,374.

Oligonucleotides of the present invention may also include base modifications or substitutions. As used herein, “unmodified” or “natural” bases include the purine bases adenine (A) and guanine (G), and the pyrimidine bases thymine (T), cytosine (C) and uracil (U). Modified bases include but are not limited to other synthetic and natural bases such as 5-methylcytosine (5-me-C), 5-hydroxymethyl cytosine, xanthine, hypoxanthine, 2-aminoadenine, 6-methyl and other alkyl derivatives of adenine and guanine, 2-propyl and other alkyl derivatives of adenine and guanine, 2-thiouracil, 2-thiothymine and 2-thiocytosine, 5-halouracil and cytosine, 5-propynyl uracil and cytosine, 6-azo uracil, cytosine and thymine, 5-uracil (pseudouracil), 4-thiouracil, 8-halo, 8-amino, 8-thiol, 8-thioalkyl, 8-hydroxyl and other 8-substituted adenines and guanines, 5-halo particularly 5-bromo, 5-trifluoromethyl and other 5-substituted uracils and cytosines, 7-methylguanine and 7-methyladenine, 8-azaguanine and 8-azaadenine, 7-deazaguanine and 7-deazaadenine and 3-deazaguanine and 3-deazaadenine. Further bases include those disclosed in U.S. Pat. No. 3,687,808, those disclosed in The Concise Encyclopedia Of Polymer Science and Engineering, pages 858-859, Kroschwitz, J. I., ed. John Wiley & Sons, 1990, those disclosed by Englisch et al., Angewandte Chemie, International Edition, 1991, 30, 613, and those disclosed by Sanghvi, Y. S., Chapter 15, Antisense Research and Applications, pages 289-302, Crooke, S. T. and Lebleu, B., ed., CRC Press, 1993. Such bases are particularly useful for increasing the binding affinity of the oligomeric compounds according to at least some embodiments of the invention. These include 5-substituted pyrimidines, 6-azapyrimidines and N-2, N-6 and O-6 substituted purines, including 2-aminopropyladenine, 5-propynyluracil and 5-propynylcytosine. 5-methylcytosine substitutions have been shown to increase nucleic acid duplex stability by 0.6-1.2° C. [Sanghvi Y S et al. (1993) Antisense Research and Applications, CRC Press, Boca Raton 276-278] and are presently preferred base substitutions, even more particularly when combined with 2′-O-methoxyethyl sugar modifications.

Another modification of the oligonucleotides according to at least some embodiments of the invention involves chemically linking to the oligonucleotide one or more moieties or conjugates, which enhance the activity, cellular distribution or cellular uptake of the oligonucleotide. Such moieties include but are not limited to lipid moieties such as a cholesterol moiety, cholic acid, a thioether, e.g., hexyl-S-tritylthiol, a thiocholesterol, an aliphatic chain, e.g., dodecandiol or undecyl residues, a phospholipid, e.g., di-hexadecyl-rac-glycerol or triethylammonium 1,2-di-O-hexadecyl-rac-glycero-3-H-phosphonate, a polyamine or a polyethylene glycol chain, or adamantane acetic acid, a palmityl moiety, or an octadecylamine or hexylamino-carbonyl-oxycholesterol moiety, as disclosed in U.S. Pat. No. 6,303,374.

It is not necessary for all positions in a given oligonucleotide molecule to be uniformly modified, and in fact more than one of the aforementioned modifications may be incorporated in a single compound or even at a single nucleoside within an oligonucleotide.

Peptides

The terms “polypeptide,” “peptide” and “protein” are used interchangeably herein to refer to a polymer of amino acid residues. The terms apply to amino acid polymers in which one or more amino acid residue is an analog or mimetic of a corresponding naturally occurring amino acid, as well as to naturally occurring amino acid polymers. Polypeptides can be modified, e.g., by the addition of carbohydrate residues to form glycoproteins. The terms “polypeptide,” “peptide” and “protein” include glycoproteins, as well as non-glycoproteins.

Polypeptide products can be biochemically synthesized such as by employing standard solid phase techniques. Such methods include exclusive solid phase synthesis, partial solid phase synthesis methods, fragment condensation, classical solution synthesis. These methods are preferably used when the peptide is relatively short (i.e., 10 kDa) and/or when it cannot be produced by recombinant techniques (i.e., not encoded by a nucleic acid sequence) and therefore involves different chemistry.

Solid phase polypeptide synthesis procedures are well known in the art and further described by John Morrow Stewart and Janis Dillaha Young, Solid Phase Peptide Syntheses (2nd Ed., Pierce Chemical Company, 1984).

Synthetic polypeptides can be purified by preparative high performance liquid chromatography [Creighton T. (1983) Proteins, structures and molecular principles. WH Freeman and Co. N.Y.] and the composition of which can be confirmed via amino acid sequencing.

In cases where large amounts of a polypeptide are desired, it can be generated using recombinant techniques such as described by Bitter et al., (1987) Methods in Enzymol. 153:516-544, Studier et al. (1990) Methods in Enzymol. 185:60-89, Brisson et al. (1984) Nature 310:511-514, Takamatsu et al. (1987) EMBO J. 6:307-311, Coruzzi et al. (1984) EMBO J. 3:1671-1680 and Brogli et al., (1984) Science 224:838-843, Gurley et al. (1986) Mol. Cell. Biol. 6:559-565.

It will be appreciated that peptides identified according to the teachings of the present invention may be degradation products, synthetic peptides or recombinant peptides as well as peptidomimetics, typically, synthetic peptides and peptoids and semipeptoids which are peptide analogs, which may have, for example, modifications rendering the peptides more stable while in a body or more capable of penetrating into cells. Such modifications include, but are not limited to N terminus modification, C terminus modification, peptide bond modification, including, but not limited to, CH2-NH, CH2-S, CH2-S═O, O═C—NH, CH2-O, CH2-CH2, S═C—NH, CH═CH or CF═CH, backbone modifications, and residue modification. Methods for preparing peptidomimetic compounds are well known in the art and are specified, for example, in Quantitative Drug Design, C. A. Ramsden Gd., Chapter 17.2, F. Choplin Pergamon Press (1992), which is incorporated by reference as if fully set forth herein. Further details in this respect are provided hereinunder.

Peptide bonds (—CO—NH—) within the peptide may be substituted, for example, by N-methylated bonds (—N(CH3)-CO—), ester bonds (—C(R)H—C—O—O—C(R)—N—), ketomethylen bonds (—CO—CH2-), α-aza bonds (—NH—N(R)—CO—), wherein R is any alkyl, e.g., methyl, carba bonds (—CH2-NH—), hydroxyethylene bonds (—CH(OH)—CH2-), thioamide bonds (—CS—NH—), olefinic double bonds (—CH═CH—), retro amide bonds (—NH—CO—), peptide derivatives (—N(R)—CH2-CO—), wherein R is the “normal” side chain, naturally presented on the carbon atom.

These modifications can occur at any of the bonds along the peptide chain and even at several (2-3) at the same time.

Natural aromatic amino acids, Trp, Tyr and Phe, may be substituted by synthetic non-natural acid such as Phenylglycine, TIC, naphthylelanine (Nol), ring-methylated derivatives of Phe, halogenated derivatives of Phe or o-methyl-Tyr.

In addition to the above, the peptides of the present invention may also include one or more modified amino acids or one or more non-amino acid monomers (e.g. fatty acids, complex carbohydrates etc).

As used herein in the specification and in the claims section below the term “amino acid” or “amino acids” is understood to include the 20 naturally occurring amino acids; those amino acids often modified post-translationally in vivo, including, for example, hydroxyproline, phosphoserine and phosphothreonine; and other unusual amino acids including, but not limited to, 2-aminoadipic acid, hydroxylysine, isodesmosine, nor-valine, nor-leucine and ornithine. Furthermore, the term “amino acid” includes both D- and L-amino acids.

Since the peptides of the present invention are preferably utilized in therapeutics which require the peptides to be in soluble form, the peptides of the present invention preferably include one or more non-natural or natural polar amino acids, including but not limited to serine and threonine which are capable of increasing peptide solubility due to their hydroxyl-containing side chain.

Expression Systems

To enable cellular expression of the polynucleotides of the present invention, a nucleic acid construct according to the present invention may be used, which includes at least a coding region of one of the above nucleic acid sequences, and further includes at least one cis acting regulatory element. As used herein, the phrase “cis acting regulatory element” refers to a polynucleotide sequence, preferably a promoter, which binds a trans acting regulator and regulates the transcription of a coding sequence located downstream thereto.

Any suitable promoter sequence can be used by the nucleic acid construct of the present invention.

Preferably, the promoter utilized by the nucleic acid construct of the present invention is active in the specific cell population transformed. Examples of cell type-specific and/or tissue-specific promoters include promoters such as albumin that is liver specific [Pinkert et al., (1987) Genes Dev. 1:268-277], lymphoid specific promoters [Calame et al., (1988) Adv. Immunol. 43:235-275]; in particular promoters of T-cell receptors [Winoto et al., (1989) EMBO J. 8:729-733] and immunoglobulins; [Banerji et al. (1983) Cell 33729-740], neuron-specific promoters such as the neurofilament promoter [Byrne et al. (1989) Proc. Natl. Acad. Sci. USA 86:5473-5477], pancreas-specific promoters [Edlunch et al. (1985) Science 230:912-916] or mammary gland-specific promoters such as the milk whey promoter (U.S. Pat. No. 4,873,316 and European Application Publication No. 264,166). The nucleic acid construct of the present invention can further include an enhancer, which can be adjacent or distant to the promoter sequence and can function in up regulating the transcription therefrom.

The nucleic acid construct of the present invention preferably further includes an appropriate selectable marker and/or an origin of replication. Preferably, the nucleic acid construct utilized is a shuttle vector, which can propagate both in E. coli (wherein the construct comprises an appropriate selectable marker and origin of replication) and be compatible for propagation in cells, or integration in a gene and a tissue of choice. The construct according to the present invention can be, for example, a plasmid, a bacmid, a phagemid, a cosmid, a phage, a virus or an artificial chromosome.

Examples of suitable constructs include, but are not limited to, pcDNA3, pcDNA3.1 (+/−), pGL3, PzeoSV2 (+/−), pDisplay, pEF/myc/cyto, pCMV/myc/cyto each of which is commercially available from Invitrogen Co. Examples of retroviral vector and packaging systems are those sold by Clontech, San Diego, Calif., including Retro-X vectors pLNCX and pLXSN, which permit cloning into multiple cloning sites and the transgene is transcribed from CMV promoter. Vectors derived from Mo-MuLV are also included such as pBabe, where the transgene will be transcribed from the 5′LTR promoter.

Currently preferred in vivo nucleic acid transfer techniques include transfection with viral or non-viral constructs, such as adenovirus, lentivirus, Herpes simplex I virus, or adeno-associated virus (AAV) and lipid-based systems. Useful lipids for lipid-mediated transfer of the gene are, for example, DOTMA, DOPE, and DC-Chol [Tonkinson et al., Cancer Investigation, 14(1): 54-65 (1996)]. The most preferred constructs for use in gene therapy are viruses, most preferably adenoviruses, AAV, lentiviruses, or retroviruses. A viral construct such as a retroviral construct includes at least one transcriptional promoter/enhancer or locus-defining elements, or other elements that control gene expression by other means such as alternate splicing, nuclear RNA export, or post-translational modification of messenger. Such vector constructs also include a packaging signal, long terminal repeats (LTRs) or portions thereof, and positive and negative strand primer binding sites appropriate to the virus used, unless it is already present in the viral construct. In addition, such a construct typically includes a signal sequence for secretion of the peptide from a host cell in which it is placed. Preferably the signal sequence for this purpose is a mammalian signal sequence or the signal sequence of the polypeptides of the present invention. Optionally, the construct may also include a signal that directs polyadenylation, as well as one or more restriction sites and a translation termination sequence. By way of example, such constructs will typically include a 5′ LTR, a tRNA binding site, a packaging signal, an origin of second-strand DNA synthesis, and a 3′ LTR or a portion thereof. Other vectors can be used that are non-viral, such as cationic lipids, polylysine, and dendrimers.

Recombinant Expression Vectors and Host Cells

Another aspect of the invention pertains to vectors, preferably expression vectors, containing a nucleic acid encoding a protein according to at least some embodiments of the invention, or derivatives, fragments, analogs or homologs thereof. As used herein, the term “vector” refers to a nucleic acid molecule capable of transporting another nucleic acid to which it has been linked. Examples of vector types are plasmids and viral vectors. Certain vectors are capable of autonomous replication in a host cell into which they are introduced (e.g., bacterial vectors having a bacterial origin of replication and episomal mammalian vectors). Other vectors (e.g., non-episomal mammalian vectors) are integrated into the genome of a host cell upon introduction into the host cell, and thereby are replicated along with the host genome. Moreover, certain vectors are capable of directing the expression of genes to which they are operatively-linked. Such vectors are referred to herein as “expression vectors”. The invention is intended to include such forms of expression vectors, such as plasmids, viral vectors (e.g., replication defective retroviruses, adenoviruses and adeno-associated viruses), which serve equivalent functions.

The recombinant expression vectors according to at least some embodiments of the invention comprise a nucleic acid according to at least some embodiments of the invention in a form suitable for expression of the nucleic acid in a host cell, which means that the recombinant expression vectors include one or more regulatory sequences, selected on the basis of the host cells to be used for expression, that is operatively-linked to the nucleic acid sequence to be expressed. Within a recombinant expression vector, “operably-linked” is intended to mean that the nucleotide sequence of interest is linked to the regulatory sequences in a manner that allows for expression of the nucleotide sequence (e.g., in an in vitro transcription/translation system or in a host cell when the vector is introduced into the host cell).

The term “regulatory sequence” is intended to include promoters, enhancers and other expression control elements (e.g., polyadenylation signals). Such regulatory sequences are described, for example, in Goeddel, Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, Calif. (1990). Regulatory sequences include those that direct constitutive expression of a nucleotide sequence in many types of host cell and those that direct expression of the nucleotide sequence only in certain host cells (e.g., tissue-specific regulatory sequences). It will be appreciated by those skilled in the art that the design of the expression vector can depend on such factors as the choice of the host cell to be transformed, the level of expression of protein desired, etc. The expression vectors according to at least some embodiments of the invention can be introduced into host cells to thereby produce proteins or peptides, including fusion proteins or peptides, encoded by nucleic acids as described herein.

The recombinant expression vectors according to at least some embodiments of the invention can be designed for production of variant proteins in prokaryotic or eukaryotic cells. For example, proteins according to at least some embodiments of the invention can be expressed in bacterial cells such as Escherichia coli, insect cells (using baculovirus expression vectors) yeast cells or mammalian cells. Suitable host cells are discussed further in Goeddel, Gene Expression Technology: Methods in Enzymology 185, Academic Press, San Diego, Calif. (1990). Alternatively, the recombinant expression vector can be transcribed and translated in vitro, for example using T7 promoter regulatory sequences and T7 polymerase.

Expression of proteins in prokaryotes is most often carried out in Escherichia coli with vectors containing constitutive or inducible promoters directing the expression of either fusion or non-fusion proteins. Fusion vectors add a number of amino acids to a protein encoded therein, to the amino or C terminus of the recombinant protein. Such fusion vectors typically serve three purposes: (i) to increase expression of recombinant protein; (ii) to increase the solubility of the recombinant protein; and (iii) to aid in the purification of the recombinant protein by acting as a ligand in affinity purification. Often, in fusion expression vectors, a proteolytic cleavage site is introduced at the junction of the fusion moiety and the recombinant protein to enable separation of the recombinant protein from the fusion moiety subsequent to purification of the fusion protein. Such enzymes, and their cognate recognition sequences, include Factor Xa, thrombin, PreScission, TEV and enterokinase. Typical fusion expression vectors include pGEX (Pharmacia Biotech Inc; Smith and Johnson, 1988. Gene 67: 31-40), pMAL (New England Biolabs, Beverly, Mass.) and pRIT5 (Pharmacia, Piscataway, N.J.) that fuse glutathione S-transferase (GST), maltose E binding protein, or protein A, respectively, to the target recombinant protein.

In another embodiment, the expression vector encoding for the protein of the invention is a yeast expression vector. Examples of vectors for expression in yeast Saccharomyces cerevisiae include pYepSec1 (Baldari, et al., 1987. EMBO J. 6: 229-234), pMFa (Kurjan and Herskowitz, 1982. Cell 30: 933-943), pJRY88 (Schultz et al., 1987. Gene 54: 113-123), pYES2 (Invitrogen Corporation, San Diego, Calif.), and picZ (InVitrogen Corp, San Diego, Calif.).

Alternatively, polypeptides of the present invention can be produced in insect cells using baculovirus expression vectors. Baculovirus vectors available for expression of proteins in cultured insect cells (e.g., SF9 cells) include the pAc series (Smith, et al., 1983. Mol. Cell. Biol. 3: 2156-2165) and the pVL series (Lucklow and Summers, 1989. Virology 170: 31-39).

In yet another embodiment, a nucleic acid of the invention is expressed in mammalian cells using a mammalian expression vector. Examples of mammalian expression vectors include pCDM8 (Seed, 1987. Nature 329: 840) and pMT2PC (Kaufman, et al., 1987. EMBO J. 6: 187-195), pIRESpuro (Clontech), pUB6 (Invitrogen), pCEP4 (Invitrogen) pREP4 (Invitrogen), pcDNA3 (Invitrogen). When used in mammalian cells, the expression vector's control functions are often provided by viral regulatory elements. For example, commonly used promoters are derived from polyoma, adenovirus 2, cytomegalovirus, Rous Sarcoma Virus, and simian virus 40. For other suitable expression systems for both prokaryotic and eukaryotic cells see, e.g., Chapters 16 and 17 of Sambrook, et al., Molecular Cloning: A Laboratory Manual. 2nd ed., Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., 1989.

In another embodiment, the recombinant mammalian expression vector is capable of directing expression of the nucleic acid preferentially in a particular cell type (e.g., tissue-specific regulatory elements are used to express the nucleic acid). Tissue-specific regulatory elements are known in the art. Non-limiting examples of suitable tissue-specific promoters include the albumin promoter (liver-specific; Pinkert, et al., 1987. Genes Dev. 1: 268-277), lymphoid-specific promoters (Calame and Eaton, 1988. Adv. Immunol. 43: 235-275), in particular promoters of T cell receptors (Winoto and Baltimore, 1989. EMBO J. 8: 729-733) and immunoglobulins (Banerji, et al., 1983. Cell 33: 729-740; Queen and Baltimore, 1983. Cell 33: 741-748), neuron-specific promoters (e.g., the neurofilament promoter; Byrne and Ruddle, 1989. Proc. Natl. Acad. Sci. USA 86: 5473-5477), pancreas-specific promoters (Edlund, et al., 1985. Science 230: 912-916), and mammary gland-specific promoters (e.g., milk whey promoter; U.S. Pat. No. 4,873,316 and European Application Publication No. 264,166). Developmentally-regulated promoters are also encompassed, e.g., the murine hox promoters (Kessel and Gruss, 1990. Science 249: 374-379) and the alpha-fetoprotein promoter (Campes and Tilghman, 1989. Genes Dev. 3: 537-546).

According to at least some embodiments the invention further provides a recombinant expression vector comprising a DNA molecule according to at least some embodiments of the invention cloned into the expression vector in an antisense orientation. That is, the DNA molecule is operatively-linked to a regulatory sequence in a manner that allows for expression (by transcription of the DNA molecule) of an RNA molecule that is antisense to mRNA encoding for protein according to at least some embodiments of the invention. Regulatory sequences operatively linked to a nucleic acid cloned in the antisense orientation can be chosen that direct the continuous expression of the antisense RNA molecule in a variety of cell types, for instance viral promoters and/or enhancers, or regulatory sequences can be chosen that direct constitutive, tissue specific or cell type specific expression of antisense RNA. The antisense expression vector can be in the form of a recombinant plasmid, phagemid or attenuated virus in which antisense nucleic acids are produced under the control of a high efficiency regulatory region, the activity of which can be determined by the cell type into which the vector is introduced. For a discussion of the regulation of gene expression using antisense genes see, e.g., Weintraub, et al., “Antisense RNA as a molecular tool for genetic analysis,” Reviews-Trends in Genetics, Vol. 1(1) 1986.

According to at least some embodiments the invention pertains to host cells into which a recombinant expression vector according to at least some embodiments of the invention has been introduced. The terms “host cell” and “recombinant host cell” are used interchangeably herein. It is understood that such terms refer not only to the particular subject cell but also to the progeny or potential progeny of such a cell. Because certain modifications may occur in succeeding generations due to either mutation or environmental influences, such progeny may not, in fact, be identical to the parent cell, but are still included within the scope of the term as used herein.

A host cell can be any prokaryotic or eukaryotic cell. For example, protein according to at least some embodiments of the invention can be produced in bacterial cells such as E. coli, insect cells, yeast, plant or mammalian cells (such as Chinese hamster ovary cells (CHO) or COS or 293 cells). Other suitable host cells are known to those skilled in the art.

Vector DNA can be introduced into prokaryotic or eukaryotic cells via conventional transformation or transfection techniques. As used herein, the terms “transformation” and “transfection” are intended to refer to a variety of art-recognized techniques for introducing foreign nucleic acid (e.g., DNA) into a host cell, including calcium phosphate or calcium chloride co-precipitation, DEAE-dextran-mediated transfection, lipofection, or electroporation. Suitable methods for transforming or transfecting host cells can be found in Sambrook, et al. (Molecular Cloning: A Laboratory Manual. 2nd ed., Cold Spring Harbor Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y., 1989), and other laboratory manuals.

For stable transfection of mammalian cells, it is known that, depending upon the expression vector and transfection technique used, only a small fraction of cells may integrate the foreign DNA into their genome. In order to identify and select these integrants, a gene that encodes a selectable marker (e.g., resistance to antibiotics) is generally introduced into the host cells along with the gene of interest. Various selectable markers include those that confer resistance to drugs, such as G418, hygromycin, puromycin, blasticidin and methotrexate. Nucleic acids encoding a selectable marker can be introduced into a host cell on the same vector as that encoding protein according to at least some embodiments of the invention or can be introduced on a separate vector. Cells stably transfected with the introduced nucleic acid can be identified by drug selection (e.g., cells that have incorporated the selectable marker gene will survive, while the other cells die).

A host cell according to at least some embodiments of the invention, such as a prokaryotic or eukaryotic host cell in culture, can be used to produce (i.e., express) protein according to at least some embodiments of the invention. Accordingly, the invention further provides methods for producing proteins according to at least some embodiments of the invention using the host cells according to at least some embodiments of the invention. In one embodiment, the method comprises culturing the host cell of the present invention (into which a recombinant expression vector encoding protein according to at least some embodiments of the invention has been introduced) in a suitable medium such that the protein according to at least some embodiments of the invention is produced. In another embodiment, the method further comprises isolating protein according to at least some embodiments of the invention from the medium or the host cell.

For efficient production of the protein, it is preferable to place the nucleotide sequences encoding the protein according to at least some embodiments of the invention under the control of expression control sequences optimized for expression in a desired host. For example, the sequences may include optimized transcriptional and/or translational regulatory sequences (such as altered Kozak sequences).

It should be noted, that according to at least some embodiments of the present invention the LY6G6F, VSIG10, TMEM25 and/or LSR proteins according to at least some embodiments of the invention may be isolated as naturally-occurring polypeptides, or from any source whether natural, synthetic, semi-synthetic or recombinant. Accordingly, the LY6G6F, VSIG10, TMEM25 and/or LSR proteins may be isolated as naturally-occurring proteins from any species, particularly mammalian, including bovine, ovine, porcine, murine, equine, and preferably human. Alternatively, the LY6G6F, VSIG10, TMEM25 and/or LSR proteins may be isolated as recombinant polypeptides that are expressed in prokaryote or eukaryote host cells, or isolated as a chemically synthesized polypeptide.

A skilled artisan can readily employ standard isolation methods to obtain isolated LY6G6F, VSIG10, TMEM25 and/or LSR proteins. The nature and degree of isolation will depend on the source and the intended use of the isolated molecules.

Transgenic Animals and Plants

According to at least some embodiments the invention also provides transgenic non-human animals and transgenic plants comprising one or more nucleic acid molecules according to at least some embodiments of the invention that may be used to produce the polypeptides according to at least some embodiments of the invention. The polypeptides can be produced in and recovered from tissue or bodily fluids, such as milk, blood or urine, of goats, cows, horses, pigs, rats, mice, rabbits, hamsters or other mammals. See, e.g., U.S. Pat. Nos. 5,827,690, 5,756,687, 5,750,172, and 5,741,957. Non-human transgenic animals and transgenic plants are produced by introducing one or more nucleic acid molecules according to at least some embodiments of the invention into the animal or plant by standard transgenic techniques. The transgenic cells used for making the transgenic animal can be embryonic stem cells, somatic cells or fertilized egg cells. The transgenic non-human organisms can be chimeric, nonchimeric heterozygotes, and nonchimeric homozygotes. See, e.g., Hogan et al. Manipulating the Mouse Embryo: A Laboratory Manual 2ed. Cold Spring Harbor Press (1999); Jackson et al., Mouse Genetics and Transgenics: A Practical Approach, Oxford University Press (2000); and Pinkert, Transgenic Animal Technology: A Laboratory Handbook, Academic Press (1999).

Gene Therapy

According to at least some embodiments of the present invention, nucleic acid sequences encoding soluble LY6G6F, VSIG10, TMEM25 and/or LSR proteins can be used in gene therapy for treatment of infectious disorders, and/or immune related disorders, and or cancer.

As used herein, “gene therapy” is a process to treat a disease by genetic manipulation so that a sequence of nucleic acid is transferred into a cell, the cell then expressing any genetic product encoded by the nucleic acid. For example, as is well known by those skilled in the art, nucleic acid transfer may be performed by inserting an expression vector containing the nucleic acid of interest into cells ex vivo or in vitro by a variety of methods including, for example, calcium phosphate precipitation, diethylaminoethyl dextran, polyethylene glycol (PEG), electroporation, direct injection, lipofection or viral infection (Sambrook et al., Molecular Cloning: A Laboratory Manual (Cold Spring Harbor Laboratory Press 1989); Kriegler M. Gene Transfer ad Expression: A Laboratory Manual (W. H. Freeman and Co, New York, N.Y., 1993) and Wu, Methods in Enzymology (Academic Press, New York, 1993). Alternatively, nucleic acid sequences of interest may be transferred into a cell in vivo in a variety of vectors and by a variety of methods including, for example, direct administration of the nucleic acid into a subject, or insertion of the nucleic acid into a viral vector and infection of the subject with the virus. Other methods used for in vivo transfer include encapsulation of the nucleic acid into liposomes, and direct transfer of the liposomes, or liposomes combined with a hemagglutinating Sendai virus, to a subject. The transfected or infected cells express the protein products encoded by the nucleic acid in order to ameliorate a disease or the symptoms of a disease.

Antibodies and Immune System Response

As used herein, the terms “immunologic”, “immunological” or “immune” response is the development of a beneficial humoral (antibody mediated) and/or a cellular (mediated by antigen-specific T cells or their secretion products) response directed against a peptide in a recipient patient. Such a response can be an active response induced by administration of immunogen or a passive response induced by administration of antibody or primed T-cells. Without wishing to be limited by a single hypothesis, a cellular immune response is elicited by the presentation of polypeptide epitopes in association with Class I or Class II MHC molecules to activate antigen-specific CD4+ T helper cells and/or CD8+ cytotoxic T cells. The response may also involve activation of monocytes, macrophages, NK cells, basophils, dendritic cells, astrocytes, microglia cells, eosinophils, activation or recruitment of neutrophils or other components of innate immunity. The presence of a cell-mediated immunological response can be determined by proliferation assays (CD4+ T cells) or CTL (cytotoxic T lymphocyte) assays. The relative contributions of humoral and cellular responses to the protective or therapeutic effect of an immunogen can be distinguished by separately isolating antibodies and T-cells from an immunized syngeneic animal and measuring protective or therapeutic effect in a second subject.

An “immunogenic agent” or “immunogen” is capable of inducing an immunological response against itself on administration to a mammal, optionally in conjunction with an adjuvant.

A “signal, transduction pathway” refers to the biochemical relationship between varieties of signal transduction molecules that play a role in the transmission of a signal from one portion of a cell to another portion of a cell.

As used herein, the phrase “cell surface receptor” includes, for example, molecules and complexes of molecules capable of receiving a signal and the transmission of such a signal across the plasma membrane of a cell.

The term “antibody” as referred to herein includes whole polyclonal and monoclonal antibodies and any antigen binding fragment (i.e., “antigen-binding portion”) or single chains thereof. An “antibody” refers to a glycoprotein comprising at least two heavy (H) chains and two light (L) chains inter-connected by disulfide bonds, or an antigen binding portion thereof. Each heavy chain is comprised of a heavy chain variable region (abbreviated herein as VH) and a heavy chain constant region. The heavy chain constant region is comprised of three domains, CH1, CH2 and CH3. Each light chain is comprised of a light chain variable region (abbreviated herein as VL) and a light chain constant region. The light chain constant region is comprised of one domain, CL. The VH and VL regions can be further subdivided into regions of hypervariability, termed complementarity determining regions (CDR), interspersed with regions that are more conserved, termed framework regions (FR). Each VH and VL is composed of three CDRs and four FRs, arranged from amino-terminus to carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, FR4. The variable regions of the heavy and light chains contain a binding domain that interacts with an antigen. The constant regions of the antibodies may mediate the binding of the immunoglobulin to host tissues or factors, including various cells of the immune system (e.g., effector cells) and the first component (C1q) of the classical complement system.

The term “antigen-binding portion” of an antibody (or simply “antibody portion”), as used herein, refers to one or more fragments of an antibody that retain the ability to specifically bind to an antigen (e.g., LY6G6F, VSIG10, TMEM25 and/or LSR molecules, and/or a fragment thereof). It has been shown that the antigen-binding function of an antibody can be performed by fragments of a full-length antibody. Examples of binding fragments encompassed within the term “antigen-binding portion” of an antibody include (i) a Fab fragment, a monovalent fragment consisting of the V Light, V Heavy, Constant light (CL) and CH1 domains; (ii) a F(ab′).2 fragment, a bivalent fragment comprising two Fab fragments linked by a disulfide bridge at the hinge region; (iii) a Fd fragment consisting of the VH and CH1 domains; (iv) a Fv fragment consisting of the VL and VH domains of a single arm of an antibody, (v) a dAb fragment (Ward et al., (1989) Nature 341:544-546), which consists of a VH domain; and (vi) an isolated complementarity determining region (CDR). Furthermore, although the two domains of the Fv fragment, VL and VH, are coded for by separate genes, they can be joined, using recombinant methods, by a synthetic linker that enables them to be made as a single protein chain in which the VL and VH regions pair to form monovalent molecules (known as single chain Fv (scFv); see e.g., Bird et al. (1988) Science 242:423-426; and Huston et al. (1988) Proc. Natl. Acad. Sci. USA 85:5879-5883). Such single chain antibodies are also intended to be encompassed within the term “antigen-binding portion” of an antibody. These antibody fragments are obtained using conventional techniques known to those with skill in the art, and the fragments are screened for utility in the same manner as are intact antibodies.

An “isolated antibody”, as used herein, is intended to refer to an antibody that is substantially free of other antibodies having different antigenic specificities (e.g., an isolated antibody that specifically binds LY6G6F, VSIG10, TMEM25 or LSR proteins and/or fragments thereof, and is substantially free of antibodies that specifically bind antigens other than LY6G6F, VSIG10, TMEM25 or LSR, respectively. An isolated antibody that specifically binds LY6G6F, VSIG10, TMEM25 or LSR proteins may, however, have cross-reactivity to other antigens, such as LY6G6F, VSIG10, TMEM25 or LSR molecules from other species, respectively. Moreover, an isolated antibody may be substantially free of other cellular material and/or chemicals.

The terms “monoclonal antibody” or “monoclonal antibody composition” as used herein refer to a preparation of antibody molecules of single molecular composition. A monoclonal antibody composition displays a single binding specificity and affinity for a particular epitope.

The term “human antibody”, as used herein, is intended to include antibodies having variable regions in which both the framework and CDR regions are derived from human germline immunoglobulin sequences. Furthermore, if the antibody contains a constant region, the constant region also is derived from human germline immunoglobulin sequences. The human antibodies according to at least some embodiments of the invention may include amino acid residues not encoded by human germline immunoglobulin sequences (e.g., mutations introduced by random or site-specific mutagenesis in vitro or by somatic mutation in vivo). However, the term “human antibody”, as used herein, is not intended to include antibodies in which CDR sequences derived from the germline of another mammalian species, such as a mouse, have been grafted onto human framework sequences.

The term “human monoclonal antibody” refers to antibodies displaying a single binding specificity which have variable regions in which both the framework and CDR regions are derived from human germline immunoglobulin sequences. In one embodiment, the human monoclonal antibodies are produced by a hybridoma which includes a B cell obtained from a transgenic nonhuman animal, e.g., a transgenic mouse, having a genome comprising a human heavy chain transgene and a light chain transgene fused to an immortalized cell.

The term “recombinant human antibody”, as used herein, includes all human antibodies that are prepared, expressed, created or isolated by recombinant means, such as (a) antibodies isolated from an animal (e.g., a mouse) that is transgenic or transchromosomal for human immunoglobulin genes or a hybridoma prepared therefrom (described further below), (b) antibodies isolated from a host cell transformed to express the human antibody, e.g., from a transfectoma, (c) antibodies isolated from a recombinant, combinatorial human antibody library, and (d) antibodies prepared, expressed, created or isolated by any other means that involve splicing of human immunoglobulin gene sequences to other DNA sequences. Such recombinant human antibodies have variable regions in which the framework and CDR regions are derived from human germline immunoglobulin sequences. In certain embodiments, however, such recombinant human antibodies can be subjected to in vitro mutagenesis (or, when an animal transgenic for human Ig sequences is used, in vivo somatic mutagenesis) and thus the amino acid sequences of the VH and VL regions of the recombinant antibodies are sequences that, while derived from and related to human germline VH and VL sequences, may not naturally exist within the human antibody germline repertoire in vivo.

As used herein, “isotype” refers to the antibody class (e.g., IgM or IgG1) that is encoded by the heavy chain constant region genes.

The phrases “an antibody recognizing an antigen” and “an antibody specific for an antigen” are used interchangeably herein with the term “an antibody which binds specifically to an antigen.”

As used herein, an antibody that “specifically binds to human LY6G6F, VSIG10, TMEM25 or LSR proteins” is intended to refer to an antibody that binds to LY6G6F, VSIG10, TMEM25 or LSR proteins, respectively, such as for example, one with a KD of 5×10-8 M, 3×10-8 M, 1×10-9 M or less.

The term “K-assoc” or “Ka”, as used herein, is intended to refer to the association rate of a particular antibody-antigen interaction, whereas the term “Kdiss” or “Kd,” as used herein, is intended to refer to the dissociation rate of a particular antibody-antigen interaction. The term “KD”, as used herein, is intended to refer to the dissociation constant, which is obtained from the ratio of Kd to Ka (i.e., Kd/Ka) and is expressed as a molar concentration (M). KD values for antibodies can be determined using methods well established in the art. A preferred method for determining the KD of an antibody is by using surface Plasmon resonance, preferably using a biosensor system such as a Biacore® system.

As used herein, the term “high affinity” for an IgG antibody refers to an antibody having a KD of 10-8 M or less, more preferably 10-9 M or less and even more preferably 10-10 M or less for a target antigen. However, “high affinity” binding can vary for other antibody isotypes. For example, “high affinity” binding for an IgM isotype refers to an antibody having a KD of 10-7 M or less, more preferably 10-8 M or less.

As used herein, the term “subject” or “patient” includes any human or nonhuman animal. The term “nonhuman animal” includes all vertebrates, e.g., mammals and non-mammals, such as nonhuman primates, sheep, dogs, cats, horses, cows, chickens, amphibians, reptiles, etc.

Anti-LY6G6F, Anti-VSIG10, Anti-TMEM25 and Anti-LSR Antibodies

The antibodies according to at least some embodiments of the invention including those having the particular germline sequences, homologous antibodies, antibodies with conservative modifications, engineered and modified antibodies are characterized by particular functional features or properties of the antibodies. For example, the antibodies bind specifically to human LY6G6F, VSIG10, TMEM25 or LSR. Preferably, an antibody according to at least some embodiments of the invention binds to corresponding LY6G6F, VSIG10, TMEM25 or LSR with high affinity, for example with a KD of 10-8 M or less or 10-9 M or less or even 10-10 M or less. The anti-LY6G6F, anti-VSIG10, anti-TMEM25 and anti-LSR antibodies according to at least some embodiments of the present invention preferably exhibit one or more of the following characteristics:

(i) binds to corresponding human LY6G6F, VSIG10, TMEM25 or LSR with a KD of 5×10-8 M or less;

(ii) modulates (enhances or inhibits) B7 immune costimulation and related activities and functions such a T cell responses involved in antitumor immunity and autoimmunity, and/or

(iii) binds to LY6G6F, VSIG10, TMEM25 or LSR antigen expressed by cancer cells including for example melanoma, cancers of liver, renal, brain, breast, colon, lung, ovary, pancreas, prostate, stomach, multiple myeloma, and hematopoietic cancer, including but not limited to lymphoma (Hodgkin's and non Hodgkin's), acute and chronic lymphoblastic leukemia and acute and chronic myeloid leukemia, but does not substantially bind to normal cells. In addition, preferably these antibodies and conjugates thereof will be effective in eliciting selective killing of such cancer cells and for modulating immune responses involved in autoimmunity and cancer.

More preferably, the antibody binds to corresponding human LY6G6F, VSIG10, TMEM25 or LSR antigen with a KD of 3×10-8 M or less, or with a KD of 1×10-9 M or less, or with a KD of 0.1×10-9 M or less, or with a KD Of 0.05×10-9 M or less or with a KD of between 1×10-9 and 1×10-11 M.

Standard assays to evaluate the binding ability of the antibodies toward LY6G6F, VSIG10, TMEM25 or LSR are known in the art, including for example, ELISAs, Western blots and RIAs. Suitable assays are described in detail in the Examples. The binding kinetics (e.g., binding affinity) of the antibodies also can be assessed by standard assays known in the art, such as by Biacore analysis.

Upon production of anti-LY6G6F, anti-VSIG10, anti-TMEM25 and anti-LSR antibody sequences from antibodies can bind to LY6G6F, VSIG10, TMEM25 or LSR the VH and VL sequences can be “mixed and matched” to create other anti-LY6G6F, anti-VSIG10, anti-TMEM25 and anti-LSR, binding molecules according to at least some embodiments of the invention. LY6G6F, VSIG10, TMEM25 or LSR binding of such “mixed and matched” antibodies can be tested using the binding assays described above. e.g., ELISAs). Preferably, when VH and VL chains are mixed and matched, a VH sequence from a particular VH/VL pairing is replaced with a structurally similar VH sequence. Likewise, preferably a VL sequence from a particular VH/VL pairing is replaced with a structurally similar VL sequence. For example, the VH and VL sequences of homologous antibodies are particularly amenable for mixing and matching.

Antibodies Having Particular Germline Sequences

In certain embodiments, an antibody of the invention comprises a heavy chain variable region from a particular germline heavy chain immunoglobulin gene and/or a light chain variable region from a particular germline light chain immunoglobulin gene.

As used herein, a human antibody comprises heavy or light chain variable regions that is “the product of” or “derived from” a particular germline sequence if the variable regions of the antibody are obtained from a system that uses human germline immunoglobulin genes. Such systems include immunizing a transgenic mouse carrying human immunoglobulin genes with the antigen of interest or screening a human immunoglobulin gene library displayed on phage with the antigen of interest. A human antibody that is “the product of” or “derived from” a human germline immunoglobulin sequence can be identified as such by comparing the amino acid sequence of the human antibody to the amino acid sequences of human germline immunoglobulins and selecting the human germline immunoglobulin sequence that is closest in sequence (i.e., greatest % identity) to the sequence of the human antibody.

A human antibody that is “the product of” or “derived from” a particular human germline immunoglobulin sequence may contain amino acid differences as compared to the germline sequence, due to, for example, naturally-occurring somatic mutations or intentional introduction of site-directed mutation. However, a selected human antibody typically is at least 90% identical in amino acids sequence to an amino acid sequence encoded by a human germline immunoglobulin gene and contains amino acid residues that identify the human antibody as being human when compared to the germline immunoglobulin amino acid sequences of other species (e.g., murine germline sequences). In certain cases, a human antibody may be at least 95, 96, 97, 98 or 99%, or even at least 96%, 97%, 98%, or 99% identical in amino acid sequence to the amino acid sequence encoded by the germline immunoglobulin gene. Typically, a human antibody derived from a particular human germline sequence will display no more than 10 amino acid differences from the amino acid sequence encoded by the human germline immunoglobulin gene. In certain cases, the human antibody may display no more than 5, or even no more than 4, 3, 2, or 1 amino acid difference from the amino acid sequence encoded by the germline immunoglobulin gene.

Homologous Antibodies

In yet another embodiment, an antibody of the invention comprises heavy and light chain variable regions comprising amino acid sequences that are homologous to isolated anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR amino acid sequences of preferred anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies, respectively, wherein the antibodies retain the desired functional properties of the parent anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies.

As used herein, the percent homology between two amino acid sequences is equivalent to the percent identity between the two sequences. The percent identity between the two sequences is a function of the number of identical positions shared by the sequences (i.e., % homology=# of identical positions/total # of positions×100), taking into account the number of gaps, and the length of each gap, which need to be introduced for optimal alignment of the two sequences. The comparison of sequences and determination of percent identity between two sequences can be accomplished using a mathematical algorithm, as described in the non-limiting examples below.

The percent identity between two amino acid sequences can be determined using the algorithm of E. Meyers and W. Miller (Comput. Appl. Biosci., 4:11-17 (1988)) which has been incorporated into the ALIGN program (version 2.0), using a PAM120 weight residue table, a gap length penalty of 12 and a gap penalty of 4. In addition, the percent identity between two amino acid sequences can be determined using the Needleman and Wunsch (J. Mol. Biol. 48:444-453 (1970)) algorithm which has been incorporated into the GAP program in the GCG software package (available commercially), using either a Blossum 62 matrix or a PAM250 matrix, and a gap weight of 16, 14, 12, 10, 8, 6, or 4 and a length weight of 1, 2, 3, 4, 5, or 6.

Additionally or alternatively, the protein sequences of the present invention can further be used as a “query sequence” to perform a search against public databases to, for example, identify related sequences. Such searches can be performed using the XBLAST program (version 2.0) of Altschul, et al. (1990) J Mol. Biol. 215:403-10. BLAST protein searches can be performed with the XBLAST program, score=50, wordlength=3 to obtain amino acid sequences homologous to the antibody molecules according to at least some embodiments of the invention. To obtain gapped alignments for comparison purposes, Gapped BLAST can be utilized as described in Altschul et al., (1997) Nucleic Acids Res. 25(17):3389-3402. When utilizing BLAST and Gapped BLAST programs, the default parameters of the respective programs (e.g., XBLAST and NBLAST) can be used.

Antibodies with Conservative Modifications

In certain embodiments, an antibody of the invention comprises a heavy chain variable region comprising CDR1, CDR2 and CDR3 sequences and a light chain variable region comprising CDR1, CDR2 and CDR3 sequences, wherein one or more of these CDR sequences comprise specified amino acid sequences based on preferred anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies isolated and produced using methods herein, or conservative modifications thereof, and wherein the antibodies retain the desired functional properties of the anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies according to at least some embodiments of the invention, respectively.

In various embodiments, the anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibody can be, for example, human antibodies, humanized antibodies or chimeric antibodies.

As used herein, the term “conservative sequence modifications” is intended to refer to amino acid modifications that do not significantly affect or alter the binding characteristics of the antibody containing the amino acid sequence. Such conservative modifications include amino acid substitutions, additions and deletions. Modifications can be introduced into an antibody according to at least some embodiments of the invention by standard techniques known in the art, such as site-directed mutagenesis and PCR-mediated mutagenesis. Conservative amino acid substitutions are ones in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art. These families include amino acids with basic side chains (e.g., lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine, tryptophan), nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine), beta-branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine). Thus, one or more amino acid residues within the CDR regions of an antibody according to at least some embodiments of the invention can be replaced with other amino acid residues from the same side chain family and the altered antibody can be tested for retained function (i.e., the functions set forth in (c) through (j) above) using the functional assays described herein.

Antibodies that Bind to the Same Epitope as Anti-LY6G6F, Anti-VSIG10, Anti-TMEM25 or Anti-LSR According to at Least Some Embodiments of the Invention.

In another embodiment, the invention provides antibodies that bind to preferred epitopes on human LY6G6F, VSIG10, TMEM25 or LSR which possess desired functional properties such as modulation of B7 co-stimulation and related functions. Other antibodies with desired epitope specificity may be selected and will have the ability to cross-compete for binding to LY6G6F, VSIG10, TMEM25 or LSR antigen with the desired antibodies.

Engineered and Modified Antibodies

An antibody according to at least some embodiments of the invention further can be prepared using an antibody having one or more of the VH and/or VL sequences derived from an anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibody starting material to engineer a modified antibody, which modified antibody may have altered properties from the starting antibody. An antibody can be engineered by modifying one or more residues within one or both variable regions (i.e., VH and/or VL), for example within one or more CDR regions and/or within one or more framework regions. Additionally or alternatively, an antibody can be engineered by modifying residues within the constant regions, for example to alter the effector functions of the antibody.

One type of variable region engineering that can be performed is CDR grafting. Antibodies interact with target antigens predominantly through amino acid residues that are located in the six heavy and light chain complementarity determining regions (CDRs). For this reason, the amino acid sequences within CDRs are more diverse between individual antibodies than sequences outside of CDRs. Because CDR sequences are responsible for most antibody-antigen interactions, it is possible to express recombinant antibodies that mimic the properties of specific naturally occurring antibodies by constructing expression vectors that include CDR sequences from the specific naturally occurring antibody grafted onto framework sequences from a different antibody with different properties (see, e.g., Riechmann, L. et al. (1998) Nature 332:323-327; Jones, P. et al. (1986) Nature 321:522-525; Queen, C. et al. (1989) Proc. Natl. Acad. See. U.S.A. 86:10029-10033; U.S. Pat. No. 5,225,539 to Winter, and U.S. Pat. Nos. 5,530,101; 5,585,089; 5,693,762 and 6,180,370 to Queen et al.)

Suitable framework sequences can be obtained from public DNA databases or published references that include germline antibody gene sequences. For example, germline DNA sequences for human heavy and light chain variable region genes can be found in the “VBase” human germline sequence database (available on the Internet), as well as in Kabat, E. A., et al. (1991) Sequences of Proteins of Immunological Interest, Fifth Edition, U.S. Department of Health and Human Services, NIH Publication No. 91-3242; Tomlinson, I. M., et al. (1992) “The Repertoire of Human Germline VH Sequences Reveals about Fifty Groups of VH Segments with Different Hypervariable Loops” J. Mol. Biol. 227:776-798; and Cox, J. P. L. et al. (1994) “A Directory of Human Germ-line VH Segments Reveals a Strong Bias in their Usage” Eur. J Immunol. 24:827-836; the contents of each of which are expressly incorporated herein by reference.

Another type of variable region modification is to mutate amino acid residues within the VH and/or VL CDR 1, CDR2 and/or CDR3 regions to thereby improve one or more binding properties (e.g., affinity) of the antibody of interest. Site-directed mutagenesis or PCR-mediated mutagenesis can be performed to introduce the mutations and the effect on antibody binding, or other functional property of interest, can be evaluated in appropriate in vitro or in vivo assays. Preferably conservative modifications (as discussed above) are introduced. The mutations may be amino acid substitutions, additions or deletions, but are preferably substitutions. Moreover, typically no more than one, two, three, four or five residues within a CDR region are altered.

Engineered antibodies according to at least some embodiments of the invention include those in which modifications have been made to framework residues within VH and/or VL, e.g. to improve the properties of the antibody. Typically such framework modifications are made to decrease the immunogenicity of the antibody. For example, one approach is to “backmutate” one or more framework residues to the corresponding germline sequence. More specifically, an antibody that has undergone somatic mutation may contain framework residues that differ from the germline sequence from which the antibody is derived. Such residues can be identified by comparing the antibody framework sequences to the germline sequences from which the antibody is derived.

In addition or alternative to modifications made within the framework or CDR regions, antibodies according to at least some embodiments of the invention may be engineered to include modifications within the Fc region, typically to alter one or more functional properties of the antibody, such as serum half-life, complement fixation, Fc receptor binding, and/or antigen-dependent cellular cytotoxicity. Furthermore, an antibody according to at least some embodiments of the invention may be chemically modified (e.g., one or more chemical moieties can be attached to the antibody) or be modified to alter its glycosylation, again to alter one or more functional properties of the antibody. Such embodiments are described further below. The numbering of residues in the Fc region is that of the EU index of Kabat.

In one embodiment, the hinge region of CH1 is modified such that the number of cysteine residues in the hinge region is altered, e.g., increased or decreased. This approach is described further in U.S. Pat. No. 5,677,425 by Bodmer et al. The number of cysteine residues in the hinge region of CH1 is altered to, for example, facilitate assembly of the light and heavy chains or to increase or decrease the stability of the antibody.

In another embodiment, the Fc hinge region of an antibody is mutated to decrease the biological half life of the antibody. More specifically, one or more amino acid mutations are introduced into the CH2-CH3 domain interface region of the Fc-hinge fragment such that the antibody has impaired Staphylococcyl protein A (SpA) binding relative to native Fc-hinge domain SpA binding. This approach is described in further detail in U.S. Pat. No. 6,165,745 by Ward et al.

In another embodiment, the antibody is modified to increase its biological half life. Various approaches are possible. For example, one or more of the following mutations can be introduced: T252L, T254S, T256F, as described in U.S. Pat. No. 6,277,375 to Ward. Alternatively, to increase the biological half life, the antibody can be altered within the CH1 or CL region to contain a salvage receptor binding epitope taken from two loops of a CH2 domain of an Fc region of an IgG, as described in U.S. Pat. Nos. 5,869,046 and 6,121,022 by Presta et al.

In yet other embodiments, the Fc region is altered by replacing at least one amino acid residue with a different amino acid residue to alter the effector functions of the antibody. For example, one or more amino acids selected from amino acid residues 234, 235, 236, 237, 297, 318, 320 and 322 can be replaced with a different amino acid residue such that the antibody has an altered affinity for an effector ligand but retains the antigen-binding ability of the parent antibody. The effector ligand to which affinity is altered can be, for example, an Fc receptor or the C1 component of complement. This approach is described in further detail in U.S. Pat. Nos. 5,624,821 and 5,648,260, both by Winter et al.

In another example, one or more amino acids selected from amino acid residues 329, 331 and 322 can be replaced with a different amino acid residue such that the antibody has altered C1q binding and/or reduced or abolished complement dependent cytotoxicity (CDC). This approach is described in further detail in U.S. Pat. No. 6,194,551 by Idusogie et al.

In another example, one or more amino acid residues within amino acid positions 231 and 239 are altered to thereby alter the ability of the antibody to fix complement. This approach is described further in PCT Publication WO 94/29351 by Bodmer et al.

In yet another example, the Fc region is modified to increase the ability of the antibody to mediate antibody dependent cellular cytotoxicity (ADCC) and/or to increase the affinity of the antibody for an Fcy receptor by modifying one or more amino acids at the following positions: 238, 239, 248, 249, 252, 254, 255, 256, 258, 265, 267, 268, 269, 270, 272, 276, 278, 280, 283, 285, 286, 289, 290, 292, 293, 294, 295, 296, 298, 301, 303, 305, 307, 309, 312, 315, 320, 322, 324, 326, 327, 329, 330, 331, 333, 334, 335, 337, 338, 340, 360, 373, 376, 378, 382, 388, 389, 398, 414, 416, 419, 430, 434, 435, 437, 438 or 439. This approach is described further in PCT Publication WO 00/42072 by Presta. Moreover, the binding sites on human IgG1 for Fc gamma RI, Fc gamma RII, Fc gammaRIII and FcRn have been mapped and variants with improved binding have been described (see Shields, R. L. et al. (2001) J. Biol. Chem. 276:6591-6604). Specific mutations at positions 256, 290, 298, 333, 334 and 339 are shown to improve binding to FcyRIII. Additionally, the following combination mutants are shown to improve Fcgamma.RIII binding: T256A/S298A, S298A/E333A, S298A/K224A and S298A/E333A/K334A. Furthermore, mutations such as M252Y/S254T/T256E or M428L/N434S improve binding to FcRn and increase antibody circulation half-life (see Chan C A and Carter P J (2010) Nature Rev Immunol 10:301-316).

In still another embodiment, the glycosylation of an antibody is modified. For example, an aglycoslated antibody can be made (i.e., the antibody lacks glycosylation). Glycosylation can be altered to, for example, increase the affinity of the antibody for antigen. Such carbohydrate modifications can be accomplished by, for example, altering one or more sites of glycosylation within the antibody sequence. For example, one or more amino acid substitutions can be made that result in elimination of one or more variable region framework glycosylation sites to thereby eliminate glycosylation at that site. Such aglycosylation may increase the affinity of the antibody for antigen. Such an approach is described in further detail in U.S. Pat. Nos. 5,714,350 and 6,350,861 by Co et al.

Additionally or alternatively, an antibody can be made that has an altered type of glycosylation, such as a hypofucosylated antibody having reduced amounts of fucosyl residues or an antibody having increased bisecting GlcNac structures. Such altered glycosylation patterns have been demonstrated to increase the ADCC ability of antibodies. Such carbohydrate modifications can be accomplished by, for example, expressing the antibody in a host cell with altered glycosylation machinery. Cells with altered glycosylation machinery have been described in the art and can be used as host cells in which to express recombinant antibodies according to at least some embodiments of the invention to thereby produce an antibody with altered glycosylation. For example, the cell lines Ms704, Ms705, and Ms709 lack the fucosyltransferase gene, FUT8 (alpha (1,6) fucosyltransferase), such that antibodies expressed in the Ms704, Ms705, and Ms709 cell lines lack fucose on their carbohydrates. The Ms704, Ms705, and Ms709 FUT8.−/− cell lines are created by the targeted disruption of the FUT8 gene in CHO/DG44 cells using two replacement vectors (see U.S. Patent Publication No. 20040110704 by Yamane et al. and Yamane-Ohnuki et al. (2004) Biotechnol Bioeng 87:614-22). As another example, EP 1,176,195 by Hanai et al. describes a cell line with a functionally disrupted FUT8 gene, which encodes a fucosyl transferase, such that antibodies expressed in such a cell line exhibit hypofucosylation by reducing or eliminating the alpha 1,6 bond-related enzyme. Hanai et al. also describe cell lines which have a low enzyme activity for adding fucose to the N-acetylglucosamine that binds to the Fc region of the antibody or does not have the enzyme activity, for example the rat myeloma cell line YB2/0 (ATCC CRL 1662). PCT Publication WO 03/035835 by Presta describes a variant CHO cell line, Lec13 cells, with reduced ability to attach fucose to Asn(297)-linked carbohydrates, also resulting in hypofucosylation of antibodies expressed in that host cell (see also Shields, R. L. et al. (2002) J. Biol. Chem. 277:26733-26740). PCT Publication WO 99/54342 by Umana et al. describes cell lines engineered to express glycoprotein-modifying glycosyl transferases (e.g., beta(1,4)-N-acetylglucosaminyltransferase III (GnTIII)) such that antibodies expressed in the engineered cell lines exhibit increased bisecting GlcNac structures which results in increased ADCC activity of the antibodies (see also Umana et al. (1999) Nat. Biotech. 17:176-180). Alternatively, the fucose residues of the antibody may be cleaved off using a fucosidase enzyme. For example, the fucosidase alpha-L-fucosidase removes fucosyl residues from antibodies (Tarentino, A. L. et al. (1975) Biochem. 14:5516-23).

Another modification of the antibodies herein that is contemplated by the invention is pegylation. An antibody can be pegylated to, for example, increase the biological (e.g., serum) half life of the antibody. To pegylate an antibody, the antibody, or fragment thereof, typically is reacted with polyethylene glycol (PEG), such as a reactive ester or aldehyde derivative of PEG, under conditions in which one or more PEG groups become attached to the antibody or antibody fragment. Preferably, the pegylation is carried out via an acylation reaction or an alkylation reaction with a reactive PEG molecule (or an analogous reactive water-soluble polymer). As used herein, the term “polyethylene glycol” is intended to encompass any of the forms of PEG that have been used to derivatize other proteins, such as mono (C1-C10) alkoxy- or aryloxy-polyethylene glycol or polyethylene glycol-maleimide. In certain embodiments, the antibody to be pegylated is an aglycosylated antibody. Methods for pegylating proteins are known in the art and can be applied to the antibodies according to at least some embodiments of the invention. See for example, EP 0 154 316 by Nishimura et al. and EP 0 401 384 by Ishikawa et al.

Methods of Engineering Antibodies

As discussed above, anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies having VH and VK sequences disclosed herein can be used to create new anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies, respectively, by modifying the VH and/or VL sequences, or the constant regions attached thereto. Thus, in another aspect according to at least some embodiments of the invention, the structural features of an anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibody according to at least some embodiments of the invention, are used to create structurally related anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies that retain at least one functional property of the antibodies according to at least some embodiments of the invention, such as binding to human LY6G6F, VSIG10, TMEM25 or LSR, respectively. For example, one or more CDR regions of one LY6G6F, VSIG10, TMEM25 or LSR antibody or mutations thereof, can be combined recombinantly with known framework regions and/or other CDRs to create additional, recombinantly-engineered, anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies according to at least some embodiments of the invention, as discussed above. Other types of modifications include those described in the previous section. The starting material for the engineering method is one or more of the VH and/or VK sequences provided herein, or one or more CDR regions thereof. To create the engineered antibody, it is not necessary to actually prepare (i.e., express as a protein) an antibody having one or more of the VH and/or VK sequences provided herein, or one or more CDR regions thereof. Rather, the information contained in the sequences is used as the starting material to create a “second generation” sequences derived from the original sequences and then the “second generation” sequences is prepared and expressed as a protein.

Standard molecular biology techniques can be used to prepare and express altered antibody sequence.

Preferably, the antibody encoded by the altered antibody sequences is one that retains one, some or all of the functional properties of the anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies, respectively, produced by methods and with sequences provided herein, which functional properties include binding to LY6G6F, VSIG10, TMEM25 or LSR antigen with a specific KD level or less and/or modulating B7 costimulation and/or selectively binding to desired target cells such as for example melanoma, cancers of liver, renal, brain, breast, colon, lung, ovary, pancreas, prostate, stomach, multiple myeloma and hematopoietic cancer, including but not limited to lymphoma (Hodgkin's and non Hodgkin's), acute and chronic lymphoblastic leukemia and acute and chronic myeloid leukemia, that express LY6G6F, VSIG10, TMEM25 and/or LSR antigen.

The functional properties of the altered antibodies can be assessed using standard assays available in the art and/or described herein.

In certain embodiments of the methods of engineering antibodies according to at least some embodiments of the invention, mutations can be introduced randomly or selectively along all or part of an anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibody coding sequence and the resulting modified anti-LY6G6F, anti-VSIG10, anti-TMEM25 or anti-LSR antibodies can be screened for binding activity and/or other desired functional properties.

Mutational methods have been described in the art. For example, PCT Publication WO 02/092780 by Short describes methods for creating and screening antibody mutations using saturation mutagenesis, synthetic ligation assembly, or a combination thereof. Alternatively, PCT Publication WO 03/074679 by Lazar et al. describes methods of using computational screening methods to optimize physiochemical properties of antibodies.

Nucleic Acid Molecules Encoding Antibodies

Another aspect of the invention pertains to nucleic acid molecules that encode the antibodies according to at least some embodiments of the invention. The nucleic acids may be present in whole cells, in a cell lysate, or in a partially purified or substantially pure form. A nucleic acid is “isolated” or “rendered substantially pure” when purified away from other cellular components or other contaminants, e.g., other cellular nucleic acids or proteins, by standard techniques, including alkaline/SDS treatment, CsCl banding, column chromatography, agarose gel electrophoresis and others well known in the art. See, F. Ausubel, et al., ed. (1987) Current Protocols in Molecular Biology, Greene Publishing and Wiley Interscience, New York. A nucleic acid according to at least some embodiments of the invention can be, for example, DNA or RNA and may or may not contain intronic sequences. In a preferred embodiment, the nucleic acid is a cDNA molecule.

Nucleic acids according to at least some embodiments of the invention can be obtained using standard molecular biology techniques. For antibodies expressed by hybridomas (e.g., hybridomas prepared from transgenic mice carrying human immunoglobulin genes as described further below), cDNAs encoding the light and heavy chains of the antibody made by the hybridoma can be obtained by standard PCR amplification or cDNA cloning techniques. For antibodies obtained from an immunoglobulin gene library (e.g., using phage display techniques), nucleic acid encoding the antibody can be recovered from the library.

Once DNA fragments encoding VH and VL segments are obtained, these DNA fragments can be further manipulated by standard recombinant DNA techniques, for example to convert the variable region genes to full-length antibody chain genes, to Fab fragment genes or to a scFv gene. In these manipulations, a VL- or VH-encoding DNA fragment is operatively linked to another DNA fragment encoding another protein, such as an antibody constant region or a flexible linker.

The term “operatively linked”, as used in this context, is intended to mean that the two DNA fragments are joined such that the amino acid sequences encoded by the two DNA fragments remain in-frame.

The isolated DNA encoding the VH region can be converted to a full-length heavy chain gene by operatively linking the VH-encoding DNA to another DNA molecule encoding heavy chain constant regions (CH1, CH2 and CH3). The sequences of human heavy chain constant region genes are known in the art (see e.g., Kabat, E. A., el al. (1991) Sequences of Proteins of Immunological Interest, Fifth Edition, U.S. Department of Health and Human Services, NIH Publication No. 91-3242) and DNA fragments encompassing these regions can be obtained by standard PCR amplification. The heavy chain constant region can be an IgG1, IgG2, IgG3, IgG4, IgA, IgE, IgM or IgD constant region, but most preferably is an IgG1 or IgG4 constant region. For a Fab fragment heavy chain gene, the VH-encoding DNA can be operatively linked to another DNA molecule encoding only the heavy chain CH1 constant region.

The isolated DNA encoding the VL region can be converted to a full-length light chain gene (as well as a Fab light chain gene) by operatively linking the VL-encoding DNA to another DNA molecule encoding the light chain constant region, CL. The sequences of human light chain constant region genes are known in the art (see e.g., Kabat, E. A., et al. (1991) Sequences of Proteins of Immunological Interest, Fifth Edition, U.S. Department of Health and Human Services, NIH Publication No. 91-3242) and DNA fragments encompassing these regions can be obtained by standard PCR amplification. The light chain constant region can be a kappa or lambda constant region, but most preferably is a kappa constant region.

To create a scFv gene, the VH- and VL-encoding DNA fragments are operatively linked to another fragment encoding a flexible linker, e.g., encoding the amino acid sequence (Gly4-Ser)3, such that the VH and VL sequences can be expressed as a contiguous single-chain protein, with the VL and VH regions joined by the flexible linker (see e.g., Bird et al. (1988) Science 242:423-426; Huston et al. (1988) Proc. Natl. Acad. Sci. USA 85:5879-5883; McCafferty et al., (1990) Nature 348:552-554).

Production of Anti-LY6G6F, Anti-VSIG10, Anti-TMEM25 or Anti-LSR Monoclonal Antibodies

Monoclonal antibodies (mAbs) of the present invention can be produced by a variety of techniques, including conventional monoclonal antibody methodology e.g., the standard somatic cell hybridization technique of Kohler and Milstein (1975) Nature 256:495. Although somatic cell hybridization procedures are preferred, in principle, other techniques for producing monoclonal antibody can be employed e.g., viral or oncogenic transformation of B lymphocytes.

A preferred animal system for preparing hybridomas is the murine system. Hybridoma production in the mouse is a very well-established procedure. Immunization protocols and techniques for isolation of immunized splenocytes for fusion are known in the art. Fusion partners (e.g., murine myeloma cells) and fusion procedures are also known.

Chimeric or humanized antibodies of the present invention can be prepared based on the sequence of a murine monoclonal antibody prepared as described above. DNA encoding the heavy and light chain immunoglobulins can be obtained from the murine hybridoma of interest and engineered to contain non-murine (e.g., human) immunoglobulin sequences using standard molecular biology techniques. For example, to create a chimeric antibody, the murine variable regions can be linked to human constant regions using methods known in the art (see e.g., U.S. Pat. No. 4,816,567 to Cabilly et al.). To create a humanized antibody, the murine CDR regions can be inserted into a human framework using methods known in the art (see e.g., U.S. Pat. No. 5,225,539 to Winter, and U.S. Pat. Nos. 5,530,101; 5,585,089; 5,693,762 and 6,180,370 to Queen et al.).

According to at least some embodiments of the invention, the antibodies are human monoclonal antibodies. Such human monoclonal antibodies directed against LY6G6F, VSIG10, TMEM25 and/or LSR can be generated using transgenic or transchromosomic mice carrying parts of the human immune system rather than the mouse system. These transgenic and transchromosomic mice include mice referred to herein as the HuMAb Mouse® and KM Mouse®, respectively, and are collectively referred to herein as “human Ig mice.” The HuMAb Mouse TM. (Medarex. Inc.) contains human immunoglobulin gene miniloci that encode unrearranged human heavy (.mu. and .gamma.) and .kappa. light chain immunoglobulin sequences, together with targeted mutations that inactivate the endogenous.mu. and .kappa. chain loci (see e.g., Lonberg, et al. (1994) Nature 368(6474): 856-859). Accordingly, the mice exhibit reduced expression of mouse IgM or .kappa., and in response to immunization, the introduced human heavy and light chain transgenes undergo class switching and somatic mutation to generate high affinity human IgGkappa. monoclonal (Lonberg, N. et al. (1994), supra; reviewed in Lonberg, N. (1994) Handbook of Experimental Pharmacology 113:49-101; Lonberg, N. and Huszar, D. (1995) Intern. Rev. Immunol. 13: 65-93, and Harding, F. and Lonberg, N. (1995) Ann. N.Y. Acad. Sci. 764:536-546). The preparation and use of the HuMab Mouse®, and the genomic modifications carried by such mice, is further described in Taylor, L. et al. (1992) Nucleic Acids Research 20:6287-6295; Chen, J. et al. (1993) International Immunology 5:647-656; Tuaillon et al. (1993) Proc. Natl. Acad. Sci. USA 90:3720-3724; Choi et al. (1993) Nature Genetics 4:117-123; Chen, J. et al. (1993) EMBO J. 12: 821-830; Tuaillon et al. (1994) J. Immunol. 152:2912-2920; Taylor, L. et al. (1994) International Immunology 6:579-591; and Fishwild, D. et al. (1996) Nature Biotechnology 14: 845-851, the contents of all of which are hereby specifically incorporated by reference in their entirety. See further, U.S. Pat. Nos. 5,545,806; 5,569,825; 5,625,126; 5,633,425; 5,789,650; 5,877,397; 5,661,016; 5,814,318; 5,874,299; and 5,770,429; all to Lonberg and Kay; U.S. Pat. No. 5,545,807 to Surani et al.; PCT Publication Nos. WO 92/03918, WO 93/12227, WO 94/25585, WO 97/13852, WO 98/24884 and WO 99/45962, all to Lonberg and Kay; and PCT Publication No. WO 01/14424 to Korman et al.

In another embodiment, human antibodies according to at least some embodiments of the invention can be raised using a mouse that carries human immunoglobulin sequences on transgenes and transchomosomes, such as a mouse that carries a human heavy chain transgene and a human light chain transchromosome. Such mice, referred to herein as “KM mice TM.”, are described in detail in PCT Publication WO 02/43478 to Ishida et al.

Still further, alternative transgenic animal systems expressing human immunoglobulin genes are available in the art and can be used to raise anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies according to at least some embodiments of the invention. For example, an alternative transgenic system referred to as the Xenomouse (Abgenix, Inc.) can be used; such mice are described in, for example, U.S. Pat. Nos. 5,939,598; 6,075,181; 6,114,598; 6, 150,584 and 6,162,963 to Kucherlapati et al.

Moreover, alternative transchromosomic animal systems expressing human immunoglobulin genes are available in the art and can be used to raise anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies according to at least some embodiments of the invention. For example, mice carrying both a human heavy chain transchromosome and a human light chain transchromosome, referred to as “TC mice” can be used; such mice are described in Tomizuka et al. (2000) Proc. Natl. Acad Sci. USA 97:722-727. Furthermore, cows carrying human heavy and light chain transchromosomes have been described in the art (Kuroiwa et al. (2002) Nature Biotechnology 20:889-894) and can be used to raise anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies according to at least some embodiments of the invention.

Human monoclonal antibodies according to at least some embodiments of the invention can also be prepared using phage display methods for screening libraries of human immunoglobulin genes. Such phage display methods for isolating human antibodies are established in the art. See for example: U.S. Pat. Nos. 5,223,409; 5,403,484; and 5,571,698 to Ladner et al.; U.S. Pat. Nos. 5,427,908 and 5,580,717 to Dower et al.; U.S. Pat. Nos. 5,969,108 and 6,172,197 to McCafferty et al.; and U.S. Pat. Nos. 5,885,793; 6,521,404; 6,544,731; 6,555,313; 6,582,915 and 6,593,081 to Griffiths et al.

Human monoclonal antibodies according to at least some embodiments of the invention can also be prepared using SCID mice into which human immune cells have been reconstituted such that a human antibody response can be generated upon immunization. Such mice are described in, for example, U.S. Pat. Nos. 5,476,996 and 5,698,767 to Wilson et al.

Immunization of Human Ig Mice

When human Ig mice are used to raise human antibodies according to at least some embodiments of the invention, such mice can be immunized with a purified or enriched preparation of LY6G6F, VSIG10, TMEM25 and/or LSR antigen and/or recombinant LY6G6F, VSIG10, TMEM25 and/or LSR, or LY6G6F, VSIG10, TMEM25 and/or LSR fusion protein, as described by Lonberg, N. et al. (1994) Nature 368(6474): 856-859; Fishwild, D. et al. (1996) Nature Biotechnology 14: 845-851; and PCT Publication WO 98/24884 and WO 01/14424. Preferably, the mice will be 6-16 weeks of age upon the first infusion. For example, a purified or recombinant preparation (5-50.mu.g) of LY6G6F, VSIG10, TMEM25 and/or LSR antigen can be used to immunize the human Ig mice intraperitoneally.

Prior experience with various antigens by others has shown that the transgenic mice respond when initially immunized intraperitoneally (IP) with antigen in complete Freund's adjuvant, followed by every other week IP immunizations (up to a total of 6) with antigen in incomplete Freund's adjuvant. However, adjuvants other than Freund's are also found to be effective. In addition, whole cells in the absence of adjuvant are found to be highly immunogenic. The immune response can be monitored over the course of the immunization protocol with plasma samples being obtained by retroorbital bleeds. The plasma can be screened by ELISA (as described below), and mice with sufficient titers of anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR human immunoglobulin can be used for fusions. Mice can be boosted intravenously with antigen 3 days before sacrifice and removal of the spleen. It is expected that 2-3 fusions for each immunization may need to be performed. Between 6 and 24 mice are typically immunized for each antigen. Usually both HCo7 and HCo12 strains are used. In addition, both HCo7 and HCo12 transgene can be bred together into a single mouse having two different human heavy chain transgenes (HCo7/HCo 12). Alternatively or additionally, the KM Mouse® strain can be used.

Generation of Hybridomas Producing Human Monoclonal Antibodies

To generate hybridomas producing human monoclonal antibodies according to at least some embodiments of the invention, splenocytes and/or lymph node cells from immunized mice can be isolated and fused to an appropriate immortalized cell line, such as a mouse myeloma cell line. The resulting hybridomas can be screened for the production of antigen-specific antibodies. For example, single cell suspensions of splenic lymphocytes from immunized mice can be fused to one-sixth the number of P3X63-Ag8.653 nonsecreting mouse myeloma cells (ATCC, CRL 1580) with 50% PEG. Cells are plated at approximately 2×10-5 in flat bottom microtiter plate, followed by a two week incubation in selective medium containing 20% fetal Clone Serum, 18% “653” conditioned media, 5% origen (IGEN), 4 mM L-glutamine, 1 mM sodium pyruvate, 5 mM HEPES, 0.055 mM 2-mercaptoethanol, 50 units/ml penicillin, 50 mg/ml streptomycin, 50 mg/ml gentamycin and 1×HAT (Sigma; the HAT is added 24 hours after the fusion). After approximately two weeks, cells can be cultured in medium in which the HAT is replaced with HT. Individual wells can then be screened by ELISA for human monoclonal IgM and IgG antibodies. Once extensive hybridoma growth occurs, medium can be observed usually after 10-14 days. The antibody secreting hybridomas can be replated, screened again, and if still positive for human IgG, the monoclonal antibodies can be subcloned at least twice by limiting dilution. The stable subclones can then be cultured in vitro to generate small amounts of antibody in tissue culture medium for characterization.

To purify human monoclonal antibodies, selected hybridomas can be grown in two-liter spinner-flasks for monoclonal antibody purification. Supernatants can be filtered and concentrated before affinity chromatography with protein A-Sepharose (Pharmacia, Piscataway, N.J.). Eluted IgG can be checked by gel electrophoresis and high performance liquid chromatography to ensure purity. The buffer solution can be exchanged into PBS, and the concentration can be determined by OD280 using 1.43 extinction coefficient. The monoclonal antibodies can be aliquoted and stored at −80 degrees C.

Generation of Transfectomas Producing Monoclonal Antibodies

Antibodies according to at least some embodiments according to at least some embodiments of the invention also can be produced in a host cell transfectoma using, for example, a combination of recombinant DNA techniques and gene transfection methods as is well known in the art (e.g., Morrison, S. (1985) Science 229:1202).

For example, to express the antibodies, or antibody fragments thereof, DNAs encoding partial or full-length light and heavy chains, can be obtained by standard molecular biology techniques (e.g., PCR amplification or cDNA cloning using a hybridoma that expresses the antibody of interest) and the DNAs can be inserted into expression vectors such that the genes are operatively linked to transcriptional and translational control sequences. In this context, the term “operatively linked” is intended to mean that an antibody gene is ligated into a vector such that transcriptional and translational control sequences within the vector serve their intended function of regulating the transcription and translation of the antibody gene. The expression vector and expression control sequences are chosen to be compatible with the expression host cell used. The antibody light chain gene and the antibody heavy chain gene can be inserted into separate vector or, more typically, both genes are inserted into the same expression vector. The antibody genes are inserted into the expression vector by standard methods (e.g., ligation of complementary restriction sites on the antibody gene fragment and vector, or blunt end ligation if no restriction sites are present). The light and heavy chain variable regions of the antibodies described herein can be used to create full-length antibody genes of any antibody isotype by inserting them into expression vectors already encoding heavy chain constant and light chain constant regions of the desired isotype such that the VH segment is operatively linked to the CH segments within the vector and the VK segment is operatively linked to the CL segment within the vector. Additionally or alternatively, the recombinant expression vector can encode a signal peptide that facilitates secretion of the antibody chain from a host cell. The antibody chain gene can be cloned into the vector such that the signal peptide is linked in-frame to the amino terminus of the antibody chain gene. The signal peptide can be an immunoglobulin signal peptide or a heterologous signal peptide (i.e., a signal peptide from a non-immunoglobulin protein).

In addition to the antibody chain genes, the recombinant expression vectors according to at least some embodiments of the invention carry regulatory sequences that control the expression of the antibody chain genes in a host cell. The term “regulatory sequence” is intended to include promoters, enhancers and other expression control elements (e.g., polyadenylation signals) that control the transcription or translation of the antibody chain genes. Such regulatory sequences are described, for example, in Goeddel (Gene Expression Technology. Methods in Enzymology 185, Academic Press, San Diego, Calif. (1990)). It will be appreciated by those skilled in the art that the design of the expression vector, including the selection of regulatory sequences, may depend on such factors as the choice of the host cell to be transformed, the level of expression of protein desired, etc. Preferred regulatory sequences for mammalian host cell expression include viral elements that direct high levels of protein expression in mammalian cells, such as promoters and/or enhancers derived from cytomegalovirus (CMV), Simian Virus 40 (SV40), adenovirus, (e.g., the adenovirus major late promoter (AdMLP) and polyoma. Alternatively, nonviral regulatory sequences may be used, such as the ubiquitin promoter or .beta.-globin promoter. Still further, regulatory elements composed of sequences from different sources, such as the SR alpha. promoter system, which contains sequences from the SV40 early promoter and the long terminal repeat of human T cell leukemia virus type 1 (Takebe, Y. et al. (1988) Mol. Cell. Biol. 8:466-472).

In addition to the antibody chain genes and regulatory sequences, the recombinant expression vectors according to at least some embodiments of the invention may carry additional sequences, such as sequences that regulate replication of the vector in host cells (e.g., origins of replication) and selectable marker genes. The selectable marker gene facilitates selection of host cells into which the vector has been introduced (see, e.g., U.S. Pat. Nos. 4,399,216, 4,634,665 and 5,179,017, all by Axel et al.). For example, typically the selectable marker gene confers resistance to drugs, such as G418, hygromycin or methotrexate, on a host cell into which the vector has been introduced. Preferred selectable marker genes include the dihydrofolate reductase (DHFR) gene (for use in dhfr− host cells with methotrexate selection/amplification) and the neo gene (for G418 selection).

For expression of the light and heavy chains, the expression vectors encoding the heavy and light chains is transfected into a host cell by standard techniques. The various forms of the term “transfection” are intended to encompass a wide variety of techniques commonly used for the introduction of exogenous DNA into a prokaryotic or eukaryotic host cell, e.g., electroporation, calcium-phosphate precipitation, DEAE-dextran transfection and the like. Although it is theoretically possible to express the antibodies according to at least some embodiments of the invention in either prokaryotic or eukaryotic host cells, expression of antibodies in eukaryotic cells, and most preferably mammalian host cells, is the most preferred because such eukaryotic cells, and in particular mammalian cells, are more likely than prokaryotic cells to assemble and secrete a properly folded and immunologically active antibody. Prokaryotic expression of antibody genes has been reported to be ineffective for production of high yields of active antibody (Boss, M. A. and Wood, C. R. (1985) Immunology Today 6:12-13).

Preferred mammalian host cells for expressing the recombinant antibodies according to at least some embodiments of the invention include Chinese Hamster Ovary (CHO cells) (including dhfr− CHO cells, described in Urlaub and Chasin, (1980) Proc. Natl. Acad. Sci. USA 77:4216-4220, used with a DHFR selectable marker, e.g., as described in R. J. Kaufman and P. A. Sharp (1982) Mol. Biol. 159:601-621), NSO myeloma cells, COS cells and SP2 cells. In particular, for use with NSO myeloma cells, another preferred expression system is the GS gene expression system disclosed in WO 87/04462, WO 89/01036 and EP 338,841. When recombinant expression vectors encoding antibody genes are introduced into mammalian host cells, the antibodies are produced by culturing the host cells for a period of time sufficient to allow for expression of the antibody in the host cells or, more preferably, secretion of the antibody into the culture medium in which the host cells are grown. Antibodies can be recovered from the culture medium using standard protein purification methods.

Characterization of Antibody Binding to Antigen

Antibodies according to at least some embodiments of the invention can be tested for binding to LY6G6F, VSIG10, TMEM25 and/or LSR by, for example, standard ELISA. Briefly, microtiter plates are coated with purified LY6G6F, VSIG10, TMEM25 and/or LSR at 0.25.mu.g/ml in PBS, and then blocked with 5% bovine serum albumin in PBS. Dilutions of antibody (e.g., dilutions of plasma from -immunized mice) are added to each well and incubated for 1-2 hours at 37 degrees C. The plates are washed with PBS/Tween and then incubated with secondary reagent (e.g., for human antibodies, a goat-anti-human IgG Fc-specific polyclonal reagent) conjugated to alkaline phosphatase for 1 hour at 37 degrees C. After washing, the plates are developed with pNPP substrate (1 mg/ml), and analyzed at OD of 405-650. Preferably, mice which develop the highest titers will be used for fusions.

An ELISA assay as described above can also be used to screen for hybridomas that show positive reactivity with LY6G6F, VSIG10, TMEM25 and/or LSR immunogen. Hybridomas that bind with high avidity to LY6G6F, VSIG10, TMEM25 and/or LSR are subcloned and further characterized. One clone from each hybridoma, which retains the reactivity of the parent cells (by ELISA), can be chosen for making a 5-10 vial cell bank stored at −140 degrees C., and for antibody purification.

To purify anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies, selected hybridomas can be grown in two-liter spinner-flasks for monoclonal antibody purification. Supernatants can be filtered and concentrated before affinity chromatography with protein A-sepharose (Pharmacia, Piscataway, N.J.). Eluted IgG can be checked by gel electrophoresis and high performance liquid chromatography to ensure purity. The buffer solution can be exchanged into PBS, and the concentration can be determined by OD280 using 1.43 extinction coefficient. The monoclonal antibodies can be aliquoted and stored at −80 degrees C.

To determine if the selected anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSRmonoclonal antibodies bind to unique epitopes, each antibody can be biotinylated using commercially available reagents (Pierce, Rockford, Ill.). Competition studies using unlabeled monoclonal antibodies and biotinylated monoclonal antibodies can be performed using LY6G6F, VSIG10, TMEM25 and/or LSR coated-ELISA plates as described above. Biotinylated mAb binding can be detected with a strep-avidin-alkaline phosphatase probe.

To determine the isotype of purified antibodies, isotype ELISAs can be performed using reagents specific for antibodies of a particular isotype. For example, to determine the isotype of a human monoclonal antibody, wells of microtiter plates can be coated with 1.mu.g/ml of anti-human immunoglobulin overnight at 4 degrees C. After blocking with 1% BSA, the plates are reacted with 1 mug/ml or less of test monoclonal antibodies or purified isotype controls, at ambient temperature for one to two hours. The wells can then be reacted with either human IgG1 or human IgM-specific alkaline phosphatase-conjugated probes. Plates are developed and analyzed as described above.

Anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSRhuman IgGs can be further tested for reactivity with LY6G6F, VSIG10, TMEM25 and/or LSR antigen, respectively, by Western blotting. Briefly, LY6G6F, VSIG10, TMEM25 and/or LSRantigen can be prepared and subjected to sodium dodecyl sulfate polyacrylamide gel electrophoresis. After electrophoresis, the separated antigens are transferred to nitrocellulose membranes, blocked with 10% fetal calf serum, and probed with the monoclonal antibodies to be tested. Human IgG binding can be detected using anti-human IgG alkaline phosphatase and developed with BCIP/NBT substrate tablets (Sigma Chem. Co., St. Louis, Mo.).

Alternative Scaffolds

According to at least some embodiments the invention relates to protein scaffolds with specificities and affinities in a range similar to specific antibodies. According to at least some embodiments the present invention relates to an antigen-binding construct comprising a protein scaffold which is linked to one or more epitope-binding domains. Such engineered protein scaffolds are usually obtained by designing a random library with mutagenesis focused at a loop region or at an otherwise permissible surface area and by selection of variants against a given target via phage display or related techniques. According to at least some embodiments the invention relates to alternative scaffolds including, but not limited to, anticalins, DARPins, Armadillo repeat proteins, protein A, lipocalins, fibronectin domain, ankyrin consensus repeat domain, thioredoxin, chemically constrained peptides and the like. According to at least some embodiments the invention relates to alternative scaffolds that are used as therapeutic agents for treatment of cancer, autoimmune and infectious diseases as well as for in vivo diagnostics.

According to at least some embodiments the invention further provides a pharmaceutical composition comprising an antigen binding construct as described herein a pharmaceutically acceptable carrier.

The term ‘Protein Scaffold’ as used herein includes but is not limited to an immunoglobulin (Ig) scaffold, for example an IgG scaffold, which may be a four chain or two chain antibody, or which may comprise only the Fc region of an antibody, or which may comprise one or more constant regions from an antibody, which constant regions may be of human or primate origin, or which may be an artificial chimera of human and primate constant regions. Such protein scaffolds may comprise antigen-binding sites in addition to the one or more constant regions, for example where the protein scaffold comprises a full IgG. Such protein scaffolds will be capable of being linked to other protein domains, for example protein domains which have antigen-binding sites, for example epitope-binding domains or ScFv domains.

A “domain” is a folded protein structure which has tertiary structure independent of the rest of the protein. Generally, domains are responsible for discrete functional properties of proteins and in many cases may be added, removed or transferred to other proteins without loss of function of the remainder of the protein and/or of the domain. A “single antibody variable domain” is a folded polypeptide domain comprising sequences characteristic of antibody variable domains. It therefore includes complete antibody variable domains and modified variable domains, for example, in which one or more loops have been replaced by sequences which are not characteristic of antibody variable domains, or antibody variable domains which have been truncated or comprise N- or C-terminal extensions, as well as folded fragments of variable domains which retain at least the binding activity and specificity of the full-length domain.

The phrase “immunoglobulin single variable domain” refers to an antibody variable domain (VH, V HH, V L) that specifically binds an antigen or epitope independently of a different V region or domain. An immunoglobulin single variable domain can be present in a format (e.g., homo- or hetero-multimer) with other, different variable regions or variable domains where the other regions or domains are not required for antigen binding by the single immunoglobulin variable domain (i.e., where the immunoglobulin single variable domain binds antigen independently of the additional variable domains). A “domain antibody” or “dAb” is the same as an “immunoglobulin single variable domain” which is capable of binding to an antigen as the term is used herein. An immunoglobulin single variable domain may be a human antibody variable domain, but also includes single antibody variable domains from other species such as rodent (for example, as disclosed in WO 00/29004), nurse shark and Camelid V HH dAbs. Camelid V HH are immunoglobulin single variable domain polypeptides that are derived from species including camel, llama, alpaca, dromedary, and guanaco, which produce heavy chain antibodies naturally devoid of light chains. Such V HH domains may be humanised according to standard techniques available in the art, and such domains are still considered to be “domain antibodies” according to the invention. As used herein “VH includes camelid V HH domains. NARV are another type of immunoglobulin single variable domain which were identified in cartilaginous fish including the nurse shark. These domains are also known as Novel Antigen Receptor variable region (commonly abbreviated to V(NAR) or NARV). For further details see Mol. Immunol. 44, 656-665 (2006) and US20050043519A.

The term “epitope-binding domain” refers to a domain that specifically binds an antigen or epitope independently of a different V region or domain, this may be a domain antibody (dAb), for example a human, camelid or shark immunoglobulin single variable domain or it may be a domain which is a derivative of a scaffold selected from the group consisting of CTLA-4 (Evibody); lipocalin; Protein A derived molecules such as Z-domain of Protein A (Affibody, SpA), A-domain (Avimer/Maxibody); Heat shock proteins such as GroEI and GroES; transferrin (trans-body); ankyrin repeat protein (DARPin); peptide aptamer; C-type lectin domain (Tetranectin); human &#947;-crystallin and human ubiquitin (affilins); PDZ domains; scorpion toxinkunitz type domains of human protease inhibitors; Armadillo repeat proteins, thioredoxin, and fibronectin (adnectin); which has been subjected to protein engineering in order to obtain binding to a ligand other than the natural ligand.

Loops corresponding to CDRs of antibodies can be substituted with heterologous sequence to confer different binding properties i.e. Evibodies. For further details see Journal of Immunological Methods 248 (1-2), 31-45 (2001) Lipocalins are a family of extracellular proteins which transport small hydrophobic molecules such as steroids, bilins, retinoids and lipids. They have a rigid secondary structure with a number of loops at the open end of the conical structure which can be engineered to bind to different target antigens. Anticalins are between 160-180 amino acids in size, and are derived from lipocalins. For further details see Biochim Biophys Acta 1482: 337-350 (2000), U.S. Pat. No. 7,250,297B1 and US20070224633. An affibody is a scaffold derived from Protein A of Staphylococcus aureus which can be engineered to bind to antigen. The domain consists of a three-helical bundle of approximately 58 amino acids. Libraries have been generated by randomisation of surface residues. For further details see Protein Eng. Des. SeI. 17, 455-462 (2004) and EP1641818A1 Avimers are multidomain proteins derived from the A-domain scaffold family. The native domains of approximately 35 amino acids adopt a defined disulphide bonded structure. Diversity is generated by shuffling of the natural variation exhibited by the family of A-domains. For further details see Nature Biotechnology 23(12), 1556-1561 (2005) and Expert Opinion on Investigational Drugs 16(6), 909-917 (June 2007) A transferrin is a monomeric serum transport glycoprotein. Transferrins can be engineered to bind different target antigens by insertion of peptide sequences in a permissive surface loop. Examples of engineered transferrin scaffolds include the Trans-body. For further details see J. Biol. Chem 274, 24066-24073 (1999).

Designed Ankyrin Repeat Proteins (DARPins) are derived from Ankyrin which is a family of proteins that mediate attachment of integral membrane proteins to the cytoskeleton. A single ankyrin repeat is a 33 residue motif consisting of two alpha helices;-beta turn. They can be engineered to bind different target antigens by randomising residues in the first alpha-helix and a beta-turn of each repeat. Their binding interface can be increased by increasing the number of modules (a method of affinity maturation). For further details see J. MoI. Biol. 332, 489-503 (2003), PNAS 100(4), 1700-1705 (2003) and J. MoI. Biol. 369, 1015-1028 (2007) and US20040132028A1.

Fibronectin is a scaffold which can be engineered to bind to antigen. Adnectins consists of a backbone of the natural amino acid sequence of the 10th domain of the 15 repeating units of human fibronectin type III (FN3). Three loops at one end of the beta;-sandwich can be engineered to enable an Adnectin to specifically recognize a therapeutic target of interest. For further details see Protein Eng. Des. SeI. 18, 435-444 (2005), US200801 39791, WO2005056764 and U.S. Pat. No. 6,818,418B1.

Peptide aptamers are combinatorial recognition molecules that consist of a constant scaffold protein, typically thioredoxin (TrxA) which contains a constrained variable peptide loop inserted at the active site. For further details see Expert Opin. Biol. Ther. 5. 783-797 (2005).

Microbodies are derived from naturally occurring microproteins of 25-50 amino acids in length which contain 3-4 cysteine bridges—examples of microproteins include KalataBI and conotoxin and knottins. The microproteins have a loop which can be engineered to include up to 25 amino acids without affecting the overall fold of the microprotein. For further details of engineered knottin domains, see WO2008098796.

Other epitope binding domains include proteins which have been used as a scaffold to engineer different target antigen binding properties include human &#947;beta-crystallin and human ubiquitin (affilins), kunitz type domains of human protease inhibitors, PDZ-domains of the Ras-binding protein AF-6, scorpion toxins (charybdotoxin), C-type lectin domain (tetranectins) are reviewed in Chapter 7—Non-Antibody Scaffolds from Handbook of Therapeutic Antibodies (2007, edited by Stefan Dubel) and Protein Science 15:14-27 (2006). Epitope binding domains of the present invention could be derived from any of these alternative protein domains.

Conjugates or Immunoconjugates

The present invention encompasses conjugates for use in immune therapy comprising the LY6G6F, VSIG10, TMEM25 and/or LSR antigen and soluble portions thereof including the ectodomain or portions or variants thereof. For example the invention encompasses conjugates wherein the ECD of the LY6G6F, VSIG10, TMEM25 and/or LSR antigen is attached to an immunoglobulin or fragment thereof. The invention contemplates the use thereof for promoting or inhibiting LY6G6F, VSIG10, TMEM25 and/or LSR antigen activities such as immune costimulation and the use thereof in treating transplant, autoimmune, and cancer indications described herein.

In another aspect, the present invention features antibody-drug conjugates (ADCs), used for example for treatment of cancer, consisting of an antibody (or antibody fragment such as a single-chain variable fragment [scFv]) linked to a payload drug (often cytotoxic). The antibody causes the ADC to bind to the target cancer cells. Often the ADC is then internalized by the cell and the drug is released into the cell. Because of the targeting, the side effects are lower and give a wider therapeutic window. Hydrophilic linkers (e.g., PEG4Mal) help prevent the drug being pumped out of resistant cancer cells through MDR (multiple drug resistance) transporters. ADCs based on cleavable linkers are thought to have a less favorable therapeutic window, but targets (tumor cell surface antigens) that do not get internalized efficiently seem more suitable for cleavable linkers.

In another aspect, the present invention features immunoconjugates comprising an anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibody, or a fragment thereof, conjugated to a therapeutic moiety, such as a cytotoxin, a drug (e.g., an immunosuppressant) or a radiotoxin. Such conjugates are referred to herein as “immunoconjugates”. Immunoconjugates that include one or more cytotoxins are referred to as “immunotoxins.” A cytotoxin or cytotoxic agent includes any agent that is detrimental to (e.g., kills) cells. Examples include taxol, cytochalasin B, gramicidin D, ethidium bromide, emetine, mitomycin, etoposide, tenoposide, vincristine, vinblastine, colchicin, doxorubicin, daunorubicin, dihydroxy anthracin dione, mitoxantrone, mithramycin, actinomycin D, 1-dehydrotestosterone, glucocorticoids, procaine, tetracaine, lidocaine, propranolol, and puromycin and analogs or homologs thereof. Therapeutic agents also include, for example, antimetabolites (e.g., methotrexate, 6-mercaptopurine, 6-thioguanine, cytarabine, 5-fluorouracil decarbazine), alkylating agents (e.g., mechlorethamine, thioepa chlorambucil, melphalan, carmustine (BSNU) and lomustine (CCNU), cyclothosphamide, busulfan, dibromomannitol, streptozotocin, mitomycin C, and cis-dichlorodiamine platinum (II) (DDP) cisplatin), anthracyclines (e.g., daunorubicin (formerly daunomycin) and doxorubicin), antibiotics (e.g., dactinomycin (formerly actinomycin), bleomycin, mithramycin, and anthramycin (AMC)), and anti-mitotic agents (e.g., vincristine and vinblastine).

Other preferred examples of therapeutic cytotoxins that can be conjugated to an antibody according to at least some embodiments of the invention include duocarmycins, calicheamicins, maytansines and auristatins, and derivatives thereof. An example of a calicheamicin antibody conjugate is commercially available (Mylotarg™; Wyeth).

Cytotoxins can be conjugated to antibodies according to at least some embodiments of the invention using linker technology available in the art. Examples of linker types that have been used to conjugate a cytotoxin to an antibody include, but are not limited to, hydrazones, thioethers, esters, disulfides and peptide-containing linkers. A linker can be chosen that is, for example, susceptible to cleavage by low pH within the lysosomal compartment or susceptible to cleavage by proteases, such as proteases preferentially expressed in tumor tissue such as cathepsins (e.g., cathepsins B, C, D).

For further discussion of types of cytotoxins, linkers and methods for conjugating therapeutic agents to antibodies, see also Saito, G. et al. (2003) Adv. Drug Deliv. Rev. 55:199-215; Trail, P. A. et al. (2003) Cancer Immunol. Immunother. 52:328-337; Payne, G. (2003) Cancer Cell 3:207-212; Allen, T. M. (2002) Nat. Rev. Cancer 2:750-763; Pastan, I. and Kreitman, R. J. (2002) Curr. Opin. Investig. Drugs 3:1089-1091; Senter, P. D. and Springer, C. J. (2001) Adv. Drug Deliv. Rev. 53:247-264.

Antibodies of the present invention also can be conjugated to a radioactive isotope to generate cytotoxic radiopharmaceuticals, also referred to as radioimmunoconjugates. Examples of radioactive isotopes that can be conjugated to antibodies for use diagnostically or therapeutically include, but are not limited to, iodine 131, indium 111, yttrium 90 and lutetium 177. Methods for preparing radioimmunconjugates are established in the art. Examples of radioimmunoconjugates are commercially available, including Zevalin (IDEC Pharmaceuticals) and Bexxar. (Corixa Pharmaceuticals), and similar methods can be used to prepare radioimmunoconjugates using the antibodies according to at least some embodiments of the invention.

The antibody conjugates according to at least some embodiments of the invention can be used to modify a given biological response, and the drug moiety is not to be construed as limited to classical chemical therapeutic agents. For example, the drug moiety may be a protein or polypeptide possessing a desired biological activity. Such proteins may include, for example, an enzymatically active toxin, or active fragment thereof, such as abrin, ricin A, pseudomonas exotoxin, or diphtheria toxin; a protein such as tumor necrosis factor or interferon-.gamma.; or, biological response modifiers such as, for example, lymphokines, interleukin-1 (“IL-1”), interleukin-2 (“IL-2”), interleukin-6 (“IL-6”), granulocyte macrophage colony stimulating factor (“GM-CSF”), granulocyte colony stimulating factor (“G-CSF”), or other growth factors.

Techniques for conjugating such therapeutic moiety to antibodies are well known, see, e.g., Amon et al., “Monoclonal Antibodies For Immunotargeting Of Drugs In Cancer Therapy”, in Monoclonal Antibodies And Cancer Therapy, Reisfeld et al. (eds.), pp. 243-56 (Alan R. Liss, Inc. 1985); Hellstrom et al., “Antibodies For Drug Delivery”, in Controlled Drug Delivery (2nd Ed.), Robinson et al. (eds.), pp. 623-53 (Marcel Dekker, Inc. 1987); Thorpe, “Antibody Carriers Of Cytotoxic Agents In Cancer Therapy: A Review”, in Monoclonal Antibodies '84: Biological And Clinical Applications, Pinchera et al. (eds.), pp. 475-506 (1985); “Analysis, Results, And Future Prospective Of The Therapeutic Use Of Radiolabeled Antibody In Cancer Therapy”, in Monoclonal Antibodies For Cancer Detection And Therapy, Baldwin et al. (eds.), pp. 303-16 (Academic Press 1985), and Thorpe et al., “The Preparation And Cytotoxic Properties Of Antibody-Toxin Conjugates”, Immunol. Rev., 62:119-58 (1982).

Bispecific Molecules

In another aspect, the present invention features bispecific molecules comprising an anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibody, or a fragment thereof, according to at least some embodiments of the invention. An antibody according to at least some embodiments of the invention, or antigen-binding portions thereof, can be derivatized or linked to another functional molecule, e.g., another peptide or protein (e.g., another antibody or ligand for a receptor) to generate a bispecific molecule that binds to at least two different binding sites or target molecules. The antibody according to at least some embodiments of the invention may in fact be derivatized or linked to more than one other functional molecule to generate multispecific molecules that bind to more than two different binding sites and/or target molecules; such multispecific molecules are also intended to be encompassed by the term “bispecific molecule” as used herein. To create a bispecific molecule according to at least some embodiments of the invention, an antibody can be functionally linked (e.g., by chemical coupling, genetic fusion, noncovalent association or otherwise) to one or more other binding molecules, such as another antibody, antibody fragment, peptide or binding mimetic, such that a bispecific molecule results.

Accordingly, the present invention includes bispecific molecules comprising at least one first binding specificity for LY6G6F, VSIG10, TMEM25 and/or LSR and a second binding specificity for a second target epitope. According to at least some embodiments of the invention, the second target epitope is an Fc receptor, e.g., human Fc gamma RI (CD64) or a human Fc alpha receptor (CD89). Therefore, the invention includes bispecific molecules capable of binding both to Fc gamma. R, Fc alpha R or Fc epsilon R expressing effector cells (e.g., monocytes, macrophages or polymorphonuclear cells (PMNs)), and to target cells expressing LY6G6F, VSIG10, TMEM25 and/or LSR, respectively. These bispecific molecules target LY6G6F, VSIG10, TMEM25 and/or LSR expressing cells to effector cell and trigger Fc receptor-mediated effector cell activities, such as phagocytosis of an LY6G6F, VSIG10, TMEM25 and/or LSR expressing cells, antibody dependent cell-mediated cytotoxicity (ADCC), cytokine release, or generation of superoxide anion.

According to at least some embodiments of the invention in which the bispecific molecule is multispecific, the molecule can further include a third binding specificity, in addition to an anti-Fc binding specificity and an anti-6f binding specificity. In one embodiment, the third binding specificity is an anti-enhancement factor (EF) portion, e.g., a molecule which binds to a surface protein involved in cytotoxic activity and thereby increases the immune response against the target cell.

The “anti-enhancement factor portion” can be an antibody, functional antibody fragment or a ligand that binds to a given molecule, e.g., an antigen or a receptor, and thereby results in an enhancement of the effect of the binding determinants for the Fc receptor or target cell antigen. The “anti-enhancement factor portion” can bind an Fc receptor or a target cell antigen. Alternatively, the anti-enhancement factor portion can bind to an entity that is different from the entity to which the first and second binding specificities bind. For example, the anti-enhancement factor portion can bind a cytotoxic T-cell (e.g., via CD2, CD3, CD8, CD28, CD4, CD40, ICAM-1 or other immune cell that results in an increased immune response against the target cell).

According to at least some embodiments of the invention, the bispecific molecules comprise as a binding specificity at least one antibody, or an antibody fragment thereof, including, e.g., an Fab, Fab′, F(ab′).sub.2, Fv, or a single chain Fv. The antibody may also be a light chain or heavy chain dimer, or any minimal fragment thereof such as a Fv or a single chain construct as described in Ladner et al. U.S. Pat. No. 4,946,778, the contents of which is expressly incorporated by reference.

In one embodiment, the binding specificity for an Fcy receptor is provided by a monoclonal antibody, the binding of which is not blocked by human immunoglobulin G (IgG). As used herein, the term “IgG receptor” refers to any of the eight.gamma.-chain genes located on chromosome 1. These genes encode a total of twelve transmembrane or soluble receptor isoforms which are grouped into three Fc.gamma. receptor classes: Fc gamma R1 (CD64), Fc gamma RII(CD32), and Fc gamma.RIII (CD 16). In one preferred embodiment, the Fc gamma. receptor a human high affinity Fc.gamma RI. The human Fc gammaRI is a 72 kDa molecule, which shows high affinity for monomeric IgG (10 8-10-9 M.-1).

The production and characterization of certain preferred anti-Fc gamma. monoclonal antibodies are described by Fanger et al. in PCT Publication WO 88/00052 and in U.S. Pat. No. 4,954,617, the teachings of which are fully incorporated by reference herein. These antibodies bind to an epitope of Fc.gamma.R1, FcyRII or FcyRIII at a site which is distinct from the Fc.gamma. binding site of the receptor and, thus, their binding is not blocked substantially by physiological levels of IgG. Specific anti-Fc.gamma.RI antibodies useful in this invention are mAb 22, mAb 32, mAb 44, mAb 62 and mAb 197. The hybridoma producing mAb 32 is available from the American Type Culture Collection, ATCC Accession No. HB9469. In other embodiments, the anti-Fey receptor antibody is a humanized form of monoclonal antibody 22 (H22). The production and characterization of the H22 antibody is described in Graziano, R. F. et al. (1995) J. Immunol. 155 (10): 4996-5002 and PCT Publication WO 94/10332. The H22 antibody producing cell line is deposited at the American Type Culture Collection under the designation HAO22CLI and has the accession no. CRL 11177.

In still other preferred embodiments, the binding specificity for an Fc receptor is provided by an antibody that binds to a human IgA receptor, e.g., an Fc-alpha receptor (Fc alpha.RI(CD89)), the binding of which is preferably not blocked by human immunoglobulin A (IgA). The term “IgA receptor” is intended to include the gene product of one alpha.-gene (Fc alpha.RI) located on chromosome 19. This gene is known to encode several alternatively spliced transmembrane isoforms of 55 to 10 kDa.

Fc.alpha.RI (CD89) is constitutively expressed on monocytes/macrophages, eosinophilic and neutrophilic granulocytes, but not on non-effector cell populations. Fc alpha RI has medium affinity (Approximately 5×10-7 M-1) for both IgA1 and IgA2, which is increased upon exposure to cytokines such as G-CSF or GM-CSF (Morton, H. C. et al. (1996) Critical Reviews in Immunology 16:423-440). Four FcaRI-specific monoclonal antibodies, identified as A3, A59, A62 and A77, which bind Fc.alpha.RI outside the IgA ligand binding domain, have been described (Monteiro, R. C. et al. (1992) J. Immunol. 148:1764).

Fc. alpha. RI and Fc gamma. RI are preferred trigger receptors for use in the bispecific molecules according to at least some embodiments of the invention because they are (1) expressed primarily on immune effector cells, e.g., monocytes, PMNs, macrophages and dendritic cells; (2) expressed at high levels (e.g., 5,000-100,000 per cell); (3) mediators of cytotoxic activities (e.g., ADCC, phagocytosis); (4) mediate enhanced antigen presentation of antigens, including self-antigens, targeted to them.

While human monoclonal antibodies are preferred, other antibodies which can be employed in the bispecific molecules according to at least some embodiments of the invention are murine, chimeric and humanized monoclonal antibodies.

The bispecific molecules of the present invention can be prepared by conjugating the constituent binding specificities, e.g., the anti-FcR and anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR binding specificities, using methods known in the art. For example, each binding specificity of the bispecific molecule can be generated separately and then conjugated to one another. When the binding specificities are proteins or peptides, a variety of coupling or cross-linking agents can be used for covalent conjugation. Examples of cross-linking agents include protein A, carbodiimide, N-succinimidyl-S-acetyl-thioacetate (SATA), 5,5′-dithiobis(2-nitrobenzoic acid) (DTNB), o-phenylenedimaleimide (oPDM), N-succinimidyl-3-(2-pyridyldithio)propionate (SPDP), and sulfosuccinimidyl 4-(N-maleimidomethyl) cyclohaxane-1-carboxylate (sulfo-SMCC) (see e.g., Karpovsky et al. (1984) J. Exp. Med. 160:1686; Liu, M A et al. (1985) Proc. Natl. Acad. Sci. USA 82:8648). Other methods include those described in Paulus (1985) Behring Ins. Mitt. No. 78, 118-132; Brennan et al. (1985) Science 229:81-83), and Glennie et al. (1987) J. Immunol. 139: 2367-2375). Preferred conjugating agents are SATA and sulfo-SMCC, both available from Pierce Chemical Co. (Rockford, Ill.).

When the binding specificities are antibodies, they can be conjugated via sulfhydryl bonding of the C-terminus hinge regions of the two heavy chains. In a particularly preferred embodiment, the hinge region is modified to contain an odd number of sulfhydryl residues, preferably one, prior to conjugation.

Alternatively, both binding specificities can be encoded in the same vector and expressed and assembled in the same host cell. This method is particularly useful where the bispecific molecule is a mAbXmAb, mAbXFab, FabXF(ab′)2 or ligandXFab fusion protein. A bispecific molecule according to at least some embodiments of the invention can be a single chain molecule comprising one single chain antibody and a binding determinant, or a single chain bispecific molecule comprising two binding determinants. Bispecific molecules may comprise at least two single chain molecules. Methods for preparing bispecific molecules are described for example in U.S. Pat. Nos. 5,260,203; 5,455,030; 4,881,175; 5,132,405; 5,091,513; 5,476,786; 5,013,653; 5,258,498; and 5,482,858.

Binding of the bispecific molecules to their specific targets can be confirmed by, for example, enzyme-linked immunosorbent assay (ELISA), radioimmunoassay (RIA), FACS analysis, bioassay (e.g., growth inhibition), or Western Blot assay. Each of these assays generally detects the presence of protein-antibody complexes of particular interest by employing a labeled reagent (e.g., an antibody) specific for the complex of interest. For example, the FcR-antibody complexes can be detected using e.g., an enzyme-linked antibody or antibody fragment which recognizes and specifically binds to the antibody-FcR complexes. Alternatively, the complexes can be detected using any of a variety of other immunoassays. For example, the antibody can be radioactively labeled and used in a radioimmunoassay (RIA) (see, for example, Weintraub, B., Principles of Radioimmunoassays, Seventh Training Course on Radioligand Assay Techniques, The Endocrine Society, March, 1986, which is incorporated by reference herein). The radioactive isotope can be detected by such means as the use of a gamma. counter or a scintillation counter or by autoradiography.

Protein Modifications

Fusion Proteins

According to at least some embodiments, LY6G6F, VSIG10, TMEM25 and/or LSR fusion polypeptides have a first fusion partner comprising all or a part of a LY6G6F, VSIG10, TMEM25 and/or LSR protein fused to a second polypeptide directly or via a linker peptide sequence or a chemical linker useful to connect the two proteins. The LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide may optionally be fused to a second polypeptide to form a fusion protein as described herein. The presence of the second polypeptide can alter the solubility, stability, affinity and/or valency of the LY6G6F, VSIG10, TMEM25 and/or LSR fusion polypeptide. As used herein, “valency” refers to the number of binding sites available per molecule. In one embodiment the second polypeptide is a polypeptide from a different source or different protein.

According to at least some embodiments, the LY6G6F, VSIG10, TMEM25 and/or LSR protein or fragment is selected for its activity for the treatment of immune related disorder and/or infectious disorder, and/or cancer as described herein.

In one embodiment, the second polypeptide contains one or more domains of an immunoglobulin heavy chain constant region, preferably having an amino acid sequence corresponding to the hinge, CH2 and CH3 regions of a human immunoglobulin Cγ1, Cγ2, Cγ3 or Cγ4 chain or to the hinge, CH2 and CH3 regions of a murine immunoglobulin Cγ2a chain. SEQ ID NO: 70 provides exemplary sequence for the hinge, CH2 and CH3 regions of a human immunoglobulin Cγ1.

According to at least some embodiments, the fusion protein is a dimeric fusion protein. In an optional dimeric fusion protein, the dimer results from the covalent bonding of Cys residue in the hinge region of two of the Ig heavy chains that are the same Cys residues that are disulfide linked in dimerized normal Ig heavy chains. Such proteins are referred to as LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, fragments or fusion proteins thereof.

In one embodiment, the immunoglobulin constant domain may contain one or more amino acid insertions, deletions or substitutions that enhance binding to specific cell types, increase the bioavailability, or increase the stability of the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, fusion proteins, or fragments thereof. Suitable amino acid substitutions include conservative and non-conservative substitutions, as described above.

The fusion proteins optionally contain a domain that functions to dimerize or multimerize two or more fusion proteins. The peptide/polypeptide linker domain can either be a separate domain, or alternatively can be contained within one of the other domains (LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide or second polypeptide) of the fusion protein. Similarly, the domain that functions to dimerize or multimerize the fusion proteins can either be a separate domain, or alternatively can be contained within one of the other domains (LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide, second polypeptide or peptide/polypeptide linker domain) of the fusion protein. In one embodiment, the dimerization/multimerization domain and the peptide/polypeptide linker domain are the same. Further specific, illustrative and non-limiting examples of dimerization/multimerization domains and linkers are given below.

Fusion proteins disclosed herein according to at least some embodiments of the present invention are of formula I: N-R1-R2-R3-C wherein “N” represents the N-terminus of the fusion protein, “C” represents the C-terminus of the fusion protein. In the further embodiment, “R1” is a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide, “R2” is an optional peptide/polypeptide or chemical linker domain, and “R3” is a second polypeptide. Alternatively, R3 may be a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide and R1 may be a second polypeptide. Various non-limiting examples of linkers are described in greater detail below.

Optionally, the fusion protein comprises the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide fragments as described herein, fused, optionally by a linker peptide of one or more amino acids (e.g. GS) to one or more “half-life extending moieties”. A “half-life extending moiety” is any moiety, for example, a polypeptide, small molecule or polymer, that, when appended to protein, extends the in vivo half-life of that protein in the body of a subject (e.g., in the plasma of the subject). For example, a half-life extending moiety is, in an embodiment of the invention, polyethylene glycol (PEG), monomethoxy PEG (mPEG) or an immunoglobulin (Ig). In an embodiment of the invention, PEG is a 5, 10, 12, 20, 30, 40 or 50 kDa moiety or larger or comprises about 12000 ethylene glycol units (PEG12000).

The fusion protein may also optionally be prepared by chemical synthetic methods and the “join” effected chemically, either during synthesis or post-synthesis. Cross-linking and other such methods may optionally be used (optionally also with the above described genetic level fusion methods), as described for example in U.S. Pat. No. 5,547,853 to Wallner et al, which is hereby incorporated by reference as if fully set forth herein as a non-limiting example only.

According to the present invention, a fusion protein may be prepared from a protein of the invention by fusion with a portion of an immunoglobulin comprising a constant region of an immunoglobulin. More preferably, the portion of the immunoglobulin comprises a heavy chain constant region which is optionally and more preferably a human heavy chain constant region. The heavy chain constant region is most preferably an IgG heavy chain constant region, and optionally and most preferably is an Fc chain, most preferably an IgG Fc fragment that comprises the hinge, CH2 and CH3 domains. The Fc chain may optionally be a known or “wild type” Fc chain, or alternatively may be mutated or truncated. The Fc portion of the fusion protein may optionally be varied by isotype or subclass, may be a chimeric or hybrid, and/or may be modified, for example to improve effector functions, control of half-life, tissue accessibility, augment biophysical characteristics such as stability, and improve efficiency of production (and less costly). Many modifications useful in construction of disclosed fusion proteins and methods for making them are known in the art, see for example Mueller, et al, MoI. Immun., 34(6):441-452 (1997), Swann, et al., Cur. Opin. Immun., 20:493-499 (2008), and Presta, Cur. Opin. Immun. 20:460-470 (2008). In some embodiments the Fc region is the native IgG1, IgG2, or IgG4 Fc region. In some embodiments the Fc region is a hybrid, for example a chimeric consisting of IgG2/IgG4 Fc constant regions.

Modifications to the Fc region include, but are not limited to, IgG4 modified to prevent binding to Fc gamma receptors and complement, IgG1 modified to improve binding to one or more Fc gamma receptors, IgG1 modified to minimize effector function (amino acid changes), IgG1 with altered/no glycan (typically by changing expression host or substituting the Asn at position 297), and IgG1 with altered pH-dependent binding to FcRn. The Fc region may include the entire hinge region, or less than the entire hinge region.

In another embodiment, the Fc domain may contain one or more amino acid insertions, deletions or substitutions that reduce binding to the low affinity inhibitory Fc receptor CD32B (FcγRIIB) and retain wild-type levels of binding to or enhance binding to the low affinity activating Fc receptor CD16A (FcγRIIIA).

Another embodiment includes IgG2-4 hybrids and IgG4 mutants that have reduced binding to FcR (Fc receptor) which increase their half life. Representative IgG2-4 hybrids and IgG4 mutants are described in Angal, S. et al., Molecular Immunology, 30(1):105-108 (1993); Mueller, J. et al., Molecular Immunology, 34(6): 441-452 (1997); and U.S. Pat. No. 6,982,323 to Wang et al. In some embodiments the IgG1 and/or IgG2 domain is deleted; for example, Angal et al. describe IgG1 and IgG2 having serine 241 replaced with a proline.

In a further embodiment, the Fc domain contains amino acid insertions, deletions or substitutions that enhance binding to CD16A. A large number of substitutions in the Fc domain of human IgG1 that increase binding to CD16A and reduce binding to CD32B are known in the art and are described in Stavenhagen, et al., Cancer Res., 57(18):8882-90 (2007). Exemplary variants of human IgG1 Fc domains with reduced binding to CD32B and/or increased binding to CD16A contain F243L, R929P, Y300L, V305I or P296L substitutions. These amino acid substitutions may be present in a human IgG1 Fc domain in any combination.

In one embodiment, the human IgG1 Fc domain variant contains a F243L, R929P and Y300L substitution. In another embodiment, the human IgG1 Fc domain variant contains a F243L, R929P, Y300L, V305I and P296L substitution. In another embodiment, the human IgG1 Fc domain variant contains an N297A/Q substitution, as these mutations abolish FcγR binding. Non-limiting, illustrative, exemplary types of mutations are described in US Patent Application No. 20060034852, published on Feb. 16, 2006, hereby incorporated by reference as if fully set forth herein. The term “Fc chain” also optionally comprises any type of Fc fragment.

Several of the specific amino acid residues that are important for antibody constant region-mediated activity in the IgG subclass have been identified. Inclusion, substitution or exclusion of these specific amino acids therefore allows for inclusion or exclusion of specific immunoglobulin constant region-mediated activity. Furthermore, specific changes may result in aglycosylation for example and/or other desired changes to the Fc chain. At least some changes may optionally be made to block a function of Fc which is considered to be undesirable, such as an undesirable immune system effect, as described in greater detail below.

Non-limiting, illustrative examples of mutations to Fc which may be made to modulate the activity of the fusion protein include the following changes (given with regard to the Fc sequence nomenclature as given by Kabat, from Kabat E A et al: Sequences of Proteins of Immunological Interest. US Department of Health and Human Services, NIH, 1991): 220C->S; 233-238 ELLGGP->EAEGAP; 265D->A, preferably in combination with 434N->A; 297N->A (for example to block N-glycosylation); 318-322 EYKCK->AYACA; 330-331AP->SS; or a combination thereof (see for example M. Clark, “Chemical Immunol and Antibody Engineering”, pp 1-31 for a description of these mutations and their effect). The construct for the Fc chain which features the above changes optionally and preferably comprises a combination of the hinge region with the CH2 and CH3 domains.

The above mutations may optionally be implemented to enhance desired properties or alternatively to block non-desired properties. For example, aglycosylation of antibodies was shown to maintain the desired binding functionality while blocking depletion of T-cells or triggering cytokine release, which may optionally be undesired functions (see M. Clark, “Chemical Immunol and Antibody Engineering”, pp 1-31). Substitution of 331 proline for serine may block the ability to activate complement, which may optionally be considered an undesired function (see M. Clark, “Chemical Immunol and Antibody Engineering”, pp 1-31). Changing 330 alanine to serine in combination with this change may also enhance the desired effect of blocking the ability to activate complement.

Residues 235 and 237 were shown to be involved in antibody-dependent cell-mediated cytotoxicity (ADCC), such that changing the block of residues from 233-238 as described may also block such activity if ADCC is considered to be an undesirable function.

Residue 220 is normally a cysteine for Fc from IgG1, which is the site at which the heavy chain forms a covalent linkage with the light chain. Optionally, this residue may be changed to another amino acid residue (e.g., serine), to avoid any type of covalent linkage (see M. Clark, “Chemical Immunol and Antibody Engineering”, pp 1-31) or by deletion or truncation.

The above changes to residues 265 and 434 may optionally be implemented to reduce or block binding to the Fc receptor, which may optionally block undesired functionality of Fc related to its immune system functions (see “Binding site on Human IgG1 for Fc Receptors”, Shields et al, Vol 276, pp 6591-6604, 2001).

The above changes are intended as illustrations only of optional changes and are not meant to be limiting in any way. Furthermore, the above explanation is provided for descriptive purposes only, without wishing to be bound by a single hypothesis.

In a further embodiment, the fusion protein includes the extracellular domain of LY6G6F, or a fragment thereof fused to an Ig Fc region. Recombinant IgLY6G6F polypeptides, fragments or fusion proteins thereof fusion proteins can be prepared by fusing the coding region of the extracellular domain of LY6G6F or a fragment thereof to the Fc region of human IgG1 or mouse IgG2a, as described previously (Chapoval, et al., Methods MoI. Med, 45:247-255 (2000)).

Optionally, LY6G6F ECD refers also to fusion protein, comprising an amino acid sequence of human LY6G6F ECD fused to human immunoglobulin Fc. Optionally, said fusion protein comprises the amino acid sequence of the human LY6G6F ECD set forth in SEQ ID NO: 2 fused to human IgG1 Fc set forth in any one of SEQ ID NOs:70, 156. Optionally, the amino acid sequence of said fusion protein is set forth in SEQ ID NO:71 or SEQ ID NO:172.

In a further embodiment, the fusion protein includes the extracellular domain of VSIG10, or a fragment thereof fused to an Ig Fc region. Recombinant IgVSIG10 polypeptides, fragments or fusion proteins thereof fusion proteins can be prepared by fusing the coding region of the extracellular domain of VSIG10 or a fragment thereof to the Fc region of human IgG1 or mouse IgG2a, as described previously (Chapoval, et al., Methods MoI. Med, 45:247-255 (2000)).

Optionally, VSIG10 ECD refers also to fusion protein, comprising an amino acid sequence of human VSIG10 ECD fused to human immunoglobulin Fc. Optionally, said fusion protein comprises the amino acid sequence of the human VSIG10 ECD, selected from the amino acid sequences set forth in any one of SEQ ID NOs: 4 and 6, fused to human IgG1 Fc set forth in any one of SEQ ID NOs:70, 156. Optionally, the amino acid sequence of said fusion protein is set forth in any one of SEQ ID NOs:72, 73, 173 and 174.

In a further embodiment, the fusion protein includes the extracellular domain of TMEM25, or a fragment thereof fused to an Ig Fc region. Recombinant IgTMEM25 polypeptides, fragments or fusion proteins thereof fusion proteins can be prepared by fusing the coding region of the extracellular domain of TMEM25 or a fragment thereof to the Fc region of human IgG1 or mouse IgG2a, as described previously (Chapoval, et al., Methods MoI. Med, 45:247-255 (2000)).

Optionally, TMEM25 ECD refers also to fusion protein, comprising an amino acid sequence of human TMEM25 ECD fused to human immunoglobulin Fc. Optionally, said fusion protein comprises the amino acid sequence of the human TMEM25 ECD set forth in SEQ ID NO: 8 fused to human IgG1 Fc set forth in any one of SEQ ID NOs:70, 156. Optionally, the amino acid sequence of said fusion protein is set forth in any one of SEQ ID NOs:74, 175.

In a further embodiment, the fusion protein includes the extracellular domain of LSR, or a fragment thereof fused to an Ig Fc region. Recombinant Ig LSR polypeptides, fragments or fusion proteins thereof fusion proteins can be prepared by fusing the coding region of the extracellular domain of LSR or a fragment thereof to the Fc region of human IgG1 or mouse IgG2a, as described previously (Chapoval, et al., Methods Mol. Med, 45:247-255. (2000)).

Optionally, LSR ECD refers also to fusion protein, comprising an amino acid sequence of human LSR ECD fused to human immunoglobulin Fc. Optionally, said fusion protein comprises the amino acid sequence of the human LSR ECD, selected from the amino acid sequences set forth in any one of SEQ ID NOs: 12, 14, 15, 16, 17, 18, 47, 48, 49 and 50, fused to human IgG1 Fc set forth in any one of SEQ ID NOs:70, 156. Optionally, the amino acid sequence of said fusion protein is set forth in any one of SEQ ID NOs:75, 76, 77, 78, 79, 80, 176, 177, 178, 179, 180, and 181.

The aforementioned exemplary fusion proteins can incorporate any combination of the variants described herein. In another embodiment the terminal lysine of the aforementioned exemplary fusion proteins is deleted.

The disclosed fusion proteins can be isolated using standard molecular biology techniques. For example, an expression vector containing a DNA sequence encoding a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, fragments or fusion proteins thereof fusion protein is transfected into 293 cells by calcium phosphate precipitation and cultured in serum-free DMEM. The supernatant is collected at 72 h and the fusion protein is purified by Protein G, or preferably Protein A SEPHAROSE® columns (Pharmacia, Uppsala, Sweden). Optionally, a DNA sequence encoding a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, fragments or fusion proteins thereof fusion protein is transfected into GPEx® retrovectors and expressed in CHO—S cells following four rounds of retrovector transduction. The protein is clarified from supernatants using protein A chromatography.

In another embodiment the second polypeptide may have a conjugation domain through which additional molecules can be bound to the LY6G6F, VSIG10, TMEM25 and/or LSR fusion proteins. In one such embodiment, the conjugated molecule is capable of targeting the fusion protein to a particular organ or tissue; further specific, illustrative, non-limiting examples of such targeting domains and/or molecules are given below.

In another such embodiment the conjugated molecule is another immunomodulatory agent that can enhance or augment the effects of the LY6G6F, VSIG10, TMEM25 and/or LSR fusion protein. In another embodiment the conjugated molecule is Polyethylene Glycol (PEG).

Peptide or Polypeptide Linker Domain

The disclosed LY6G6F, VSIG10, TMEM25 and/or LSR fusion proteins optionally contain a peptide or polypeptide linker domain that separates the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide from the second polypeptide. In one embodiment, the linker domain contains the hinge region of an immunoglobulin. In a further embodiment, the hinge region is derived from a human immunoglobulin. Suitable human immunoglobulins that the hinge can be derived from include IgG, IgD and IgA. In a further embodiment, the hinge region is derived from human IgG. Amino acid sequences of immunoglobulin hinge regions and other domains are well known in the art. In one embodiment, LY6G6F, VSIG10, TMEM25 and/or LSR fusion polypeptides contain the hinge, CH2 and CH3 regions of a human immunoglobulin Cγ1 chain, optionally with the Cys at position 220 (according to full length human IgG1, position 5 in SEQ ID NO:70) replaced with a Ser (SEQ ID NO: 156) having at least 85%, 90%, 95%, 99% or 100% sequence homology to amino acid sequence set forth in SEQ ID NO:70:

EPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTL MISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHN AKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKC KVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRD ELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNY KTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCS VMHEALHNHYTQKSLSLSPGK The hinge can be further shortened to remove amino acids 1, 2, 3, 4, 5, or combinations thereof of any one of SEQ ID NOs: 70 or 156. In one embodiment, amino acids 1-5 of any one of SEQ ID NOs: 70 or 156 are deleted. Exemplary LY6G6F, VSIG10, TMEM25 and/or LSR fusion polypeptides comprised of the hinge, CH2 and CH3 regions of a human immunoglobulin Cγ1 chain with the Cys at position 220 replaced with a Ser are set forth in SEQ ID NOs:71, 72, 73, 74, 75, 76, 77, 78, 79, 80.

In another embodiment, LY6G6F, VSIG10, TMEM25 and/or LSR fusion polypeptides contain the CH2 and CH3 regions of a human immunoglobulin Cγ1 chain having at least 85%, 90%, 95%, 99% or 100% sequence homology to amino acid sequence set forth in SEQ ID NO:157: APELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKA KGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYKTT PPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK In another embodiment, the LY6G6F, VSIG10, TMEM25 and/or LSR fusion polypeptides contain the CH2 and CH3 regions of a murine immunoglobulin Cγ2a chain at least 85%, 90%, 95%, 99% or 100% sequence homology to amino acid sequence set forth in SEQ ID NO: 158: EPRGPTIKPCPPCKCPAPNLLGGPSVFIFPPKIKDVLMISLSPIVTCVVVDVSEDDPD VQISWFVNNVEVHTAQTQTHREDYNSTLRVVSALPIQHQDWMSGKEFKCKVNN KDLPAPIERTISKPKGSVRAPQVYVLPPPEEEMTKKQVTLTCMVTDFMPEDIYVE WTNNGKTELNYKNTEPVLDSDGSYFMYSKLRVEKKNWVERNSYSCSVVHEGLH NHHTTKSFSRTPGK. In another embodiment, the linker domain contains a hinge region of an immunoglobulin as described above, and further includes one or more additional immunoglobulin domains.

Other suitable peptide/polypeptide linker domains include naturally occurring or non-naturally occurring peptides or polypeptides. Peptide linker sequences are at least 2 amino acids in length. Optionally the peptide or polypeptide domains are flexible peptides or polypeptides. A “flexible linker” herein refers to a peptide or polypeptide containing two or more amino acid residues joined by peptide bond(s) that provides increased rotational freedom for two polypeptides linked thereby than the two linked polypeptides would have in the absence of the flexible linker. Such rotational freedom allows two or more antigen binding sites joined by the flexible linker to each access target antigen(s) more efficiently. Exemplary flexible peptides/polypeptides include, but are not limited to, the amino acid sequences Gly-Ser (SEQ ID NO:159), Gly-Ser-Gly-Ser (SEQ ID NO:160), Ala-Ser (SEQ ID NO:161), Gly-Gly-Gly-Ser (SEQ ID NO:162), Gly4-Ser (SEQ ID NO:163), (Gly4-Ser)2 (SEQ ID NO:164), (Gly4-Ser)3 (SEQ ID NO:165) and (Gly4-Ser)4 (SEQ ID NO: 166). Additional flexible peptide/polypeptide sequences are well known in the art. Other suitable peptide linker domains include helix forming linkers such as Ala-(Glu-Ala-Ala-Ala-Lys)n-Ala (n=1-5). Additional helix forming peptide/polypeptide sequences are well known in the art. Non-limiting examples of such linkers are depicted in SEQ ID NO:167-171.

Dimerization, Multimerization and Targeting Domains

The fusion proteins disclosed herein optionally contain a dimerization or multimerization domain that functions to dimerize or multimerize two or more fusion proteins. The domain that functions to dimerize or multimerize the fusion proteins can either be a separate domain, or alternatively can be contained within one of the other domains (LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide, second polypeptide, or peptide/polypeptide linker domain) of the fusion protein.

Dimerization or multimerization can occur between or among two or more fusion proteins through dimerization or multimerization domains.

Alternatively, dimerization or multimerization of fusion proteins can occur by chemical crosslinking. The dimers or multimers that are formed can be homodimeric/homomultimeric or heterodimeric/heteromultimeric. The second polypeptide “partner” in the LY6G6F, VSIG10, TMEM25 and/or LSR fusion polypeptides may be comprised of one or more other proteins, protein fragments or peptides as described herein, including but not limited to any immunoglobulin (Ig) protein or portion thereof, preferably the Fc region, or a portion of a biologically or chemically active protein such as the papillomavirus E7 gene product, melanoma-associated antigen p97), and HIV env protein (gp120). The “partner” is optionally selected to provide a soluble dimer/multimer and/or for one or more other biological activities as described herein.

A “dimerization domain” is formed by the association of at least two amino acid residues or of at least two peptides or polypeptides (which may have the same, or different, amino acid sequences). The peptides or polypeptides may interact with each other through covalent and/or non-covalent associations). Optional dimerization domains contain at least one cysteine that is capable of forming an intermolecular disulfide bond with a cysteine on the partner fusion protein. The dimerization domain can contain one or more cysteine residues such that disulfide bond(s) can form between the partner fusion proteins. In one embodiment, dimerization domains contain one, two or three to about ten cysteine residues. In a further embodiment, the dimerization domain is the hinge region of an immunoglobulin.

Additional exemplary dimerization domains can be any known in the art and include, but not limited to, coiled coils, acid patches, zinc fingers, calcium hands, a CH1-CL pair, an “interface” with an engineered “knob” and/or “protruberance” as described in U.S. Pat. No. 5,821,333, leucine zippers (e.g., from jun and/or fos) (U.S. Pat. No. 5,932,448), and/or the yeast transcriptional activator GCN4, SH2 (src homology 2), SH3 (src Homology 3) (Vidal, et al, Biochemistry, 43, 7336-44 ((2004)), phosphotyrosine binding (PTB) (Zhou, et al., Nature, 378:584-592 (1995)), WW (Sudol, Prog, Biochys. MoL Bio., 65:113-132 (1996)), PDZ (Kim, et al., Nature, 378: 85-88 (1995); Komau, et al, Science, 269.1737-1740 (1995)) 14-3-3, WD40 (Hu5 et al., J Biol Chem., 273, 33489-33494 (1998)) EH, Lim, an isoleucine zipper, a receptor dimer pair (e.g., interleukin-8 receptor (IL-8R); and integrin heterodimers such as LFA-I and GPIIIb/IIIa), or the dimerization region(s) thereof, dimeric ligand polypeptides (e.g. nerve growth factor (NGF), neurotrophin-3 (NT-3), interleukin-8 (IL-8), vascular endothelial growth factor (VEGF), VEGF-C, VEGF-D, PDGF members, and brain-derived neurotrophic factor (BDNF) (Arakawa, et al., J Biol. Chem., 269(45): 27833-27839 (1994) and Radziejewski, et al., Biochem., 32(48): 1350 (1993)) and can also be variants of these domains in which the affinity is altered. The polypeptide pairs can be identified by methods known in the art, including yeast two hybrid screens. Yeast two hybrid screens are described in U.S. Pat. Nos. 5,283,173 and 6,562,576. Affinities between a pair of interacting domains can be determined using methods known in the art, including as described in Katahira, et at, J. Biol Chem, 277, 9242-9246 (2002)). Alternatively, a library of peptide sequences can be screened for heterodimerization, for example, using the methods described in WO 01/00814. Useful methods for protein-protein interactions are also described in U.S. Pat. No. 6,790,624.

A “multimerization domain” is a domain that causes three or more peptides or polypeptides to interact with each other through covalent and/or non-covalent association(s). Suitable multimerization domains include, but are not limited to, coiled-coil domains. A coiled-coil is a peptide sequence with a contiguous pattern of mainly hydrophobic residues spaced 3 and 4 residues apart, usually in a sequence of seven amino acids (heptad repeat) or eleven amino acids (undecad repeat), which assembles (folds) to form a multimeric bundle of helices. Coiled-coils with sequences including some irregular distribution of the 3 and 4 residues spacing are also contemplated. Hydrophobic residues are in particular the hydrophobic amino acids Val, Ile, Leu, Met, Tyr, Phe and Trp. “Mainly hydrophobic” means that at least 50% of the residues must be selected from the mentioned hydrophobic amino acids.

The coiled coil domain may be derived from laminin. In the extracellular space, the heterotrimeric coiled coil protein laminin plays an important role in the formation of basement membranes. Apparently, the multifunctional oligomeric structure is required for laminin function. Coiled coil domains may also be derived from the thrombospondins in which three (TSP-I and TSP-2) or five (TSP-3, TSP-4 and TSP-5) chains are connected, or from COMP (COMPcc) (Guo, et at., EMBO J, 1998, 17: 5265-5272) which folds into a parallel five-stranded coiled coil (Malashkevich, et al., Science, 274: 761-765 (1996)). Additional non limiting examples of coiled-coil domains derived from other proteins, and other domains that mediate polypeptide multimerization are known in the art such as the vasodialator-stimulated phosphoprotein (VASP) domain, matrilin-1 (CMP), viral fusion peptides, soluble NSF (N-ethylmaleimide-sensitive factor) Attachment Protein receptor (SNARE) complexes, leucine-rich repeats, certain tRNA synthetases, are suitable for use in the disclosed fusion proteins.

In another embodiment, LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, fusion proteins, or fragments thereof can be induced to form multimers by binding to a second multivalent polypeptide, such as an antibody. Antibodies suitable for use to multimerize LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, fusion proteins, or fragments thereof include, but are not limited to, IgM antibodies and cross-linked, multivalent IgG, IgA, IgD, or IgE complexes.

Dimerization or multimerization can occur between or among two or more fusion proteins through dimerization or multimerization domains, including those described above. Alternatively, dimerization or multimerization of fusion proteins can occur by chemical crosslinking. Fusion protein dimers can be homodimers or heterodimers. Fusion protein multimers can be homomultimers or heteromultimers. Fusion protein dimers as disclosed herein are of formula N-R1-R2-R3-C N-R4-R5-R6-C or, alternatively, are of formula N-R1-R2-R3-C C-R4-R5-R6-N wherein the fusion proteins of the dimer provided by formula II are defined as being in a parallel orientation and the fusion proteins of the dimer provided by formula III are defined as being in an antiparallel orientation. Parallel and antiparallel dimers are also referred to as cis and trans dimers, respectively. “N” and “C” represent the N- and C-termini of the fusion protein, respectively. The fusion protein constituents “R1”, “R2” and “R3” are as defined above with respect to formula I. With respect to both formula II and formula III, “R4” is a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide or a second polypeptide, “R5” is an optional peptide/polypeptide linker domain, and “R6” is a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide or a second polypeptide, wherein “R6” is a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide when “R4” is a second polypeptide, and “R6” is a second polypeptide when “R4” is a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide. In one embodiment, “R1” is a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide, “R4” is also a LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide, and “R3” and “R6” are both second polypeptides.

Fusion protein dimers of formula II are defined as homodimers when “R1”=“R4”, “R2”=“R5” and “R3”=“R6”. Similarly, fusion protein dimers of formula III are defined as homodimers when “R1”=“R6”, “R2”=“R5” and “R3”=“R4”. Fusion protein dimers are defined as heterodimers when these conditions are not met for any reason. For example, heterodimers may contain domain orientations that meet these conditions (i.e., for a dimer according to formula II, “R1” and “R4” are both LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, “R2” and “R5” are both peptide/polypeptide linker domains and “R3” and “R6” are both second polypeptides), however the species of one or more of these domains is not identical. For example, although “R3” and “R6” may both be LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides, one polypeptide may contain a wild-type LY6G6F, VSIG10, TMEM25 and/or LSR amino acid sequence while the other polypeptide may be a variant LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide. An exemplary variant LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide is LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide that has been modified to have increased or decreased binding to a target cell, increased activity on immune cells, increased or decreased half life or stability. Dimers of fusion proteins that contain either a CHI or CL region of an immunoglobulin as part of the polypeptide linker domain preferably form heterodimers wherein one fusion protein of the dimer contains a CHI region and the other fusion protein of the dimer contains a CL region.

Fusion proteins can also be used to form multimers. As with dimers, multimers may be parallel multimers, in which all fusion proteins of the multimer are aligned in the same orientation with respect to their N- and C-termini. Multimers may be antiparallel multimers, in which the fusion proteins of the multimer are alternatively aligned in opposite orientations with respect to their N- and C-termini. Multimers (parallel or antiparallel) can be either homomultimers or heteromultimers.

The fusion protein is optionally produced in dimeric form; more preferably, the fusion is performed at the genetic level as described below, by joining polynucleotide sequences corresponding to the two (or more) proteins, portions of proteins and/or peptides, such that a joined or fused protein is produced by a cell according to the joined polynucleotide sequence. A description of preparation for such fusion proteins is described with regard to U.S. Pat. No. 5,851,795 to Linsley et al, which is hereby incorporated by reference as if fully set forth herein as a non-limiting example only.

Targeting Domains

The LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides and fusion proteins can contain a targeting domain to target the molecule to specific sites in the body. Optional targeting domains target the molecule to areas of inflammation. Exemplary targeting domains are antibodies, or antigen binding fragments thereof that are specific for inflamed tissue or to a proinflammatory cytokine including but not limited to IL17, IL-4, IL-6, IL-12, IL-21, IL-22, and IL-23. In the case of neurological disorders such as Multiple Sclerosis, the targeting domain may target the molecule to the CNS or may bind to VCAM-I on the vascular epithelium. Additional targeting domains can be peptide aptamers specific for a proinflammatory molecule. In other embodiments, the LY6G6F, VSIG10, TMEM25 and/or LSR fusion protein can include a binding partner specific for a polypeptide displayed on the surface of an immune cell, for example a T cell. In still other embodiments, the targeting domain specifically targets activated immune cells. Optional immune cells that are targeted include Th0, Th1, Th 17, Th2 and Th22 T cells, other cells that secrete, or cause other cells to secrete inflammatory molecules including, but not limited to, IL-1beta, TNF-alpha, TGF-beta, IFN-gamma, IL-17, IL-6, IL-23, IL-22, IL-21, and MMPs, and Tregs. For example, a targeting domain for Tregs may bind specifically to CD25. The above changes are intended as illustrations only of optional changes and are not meant to be limiting in any way. Furthermore, the above explanation is provided for descriptive purposes only, without wishing to be bound by a single hypothesis.

Addition of Groups

If a protein according to the present invention is a linear molecule, it is possible to place various functional groups at various points on the linear molecule which are susceptible to or suitable for chemical modification. Functional groups can be added to the termini of linear forms of the protein according to at least some embodiments of the invention. In some embodiments, the functional groups improve the activity of the protein with regard to one or more characteristics, including but not limited to, improvement in stability, penetration (through cellular membranes and/or tissue barriers), tissue localization, efficacy, decreased clearance, decreased toxicity, improved selectivity, improved resistance to expulsion by cellular pumps, and the like. For convenience sake and without wishing to be limiting, the free N-terminus of one of the sequences contained in the compositions according to at least some embodiments of the invention will be termed as the N-terminus of the composition, and the free C-terminal of the sequence will be considered as the C-terminus of the composition. Either the C-terminus or the N-terminus of the sequences, or both, can be linked to a carboxylic acid functional groups or an amine functional group, respectively.

Non-limiting examples of suitable functional groups are described in Green and Wuts, “Protecting Groups in Organic Synthesis”, John Wiley and Sons, Chapters 5 and 7, 1991, the teachings of which are incorporated herein by reference. Preferred protecting groups are those that facilitate transport of the active ingredient attached thereto into a cell, for example, by reducing the hydrophilicity and increasing the lipophilicity of the active ingredient, these being an example for “a moiety for transport across cellular membranes”.

These moieties can optionally and preferably be cleaved in vivo, either by hydrolysis or enzymatically, inside the cell. (Differ et al., J. Pharm. Sci. 57:783 (1968); Differ et al., J. Pharm. Sci. 57:828 (1968); Differ et al., J. Pharm. Sci. 58:557 (1969); King et al., Biochemistry 26:2294 (1987); Lindberg et al., Drug Metabolism and Disposition 17:311 (1989); and Tunek et al., Biochem. Pharm. 37:3867 (1988), Anderson et al., Arch. Biochem. Biophys. 239:538 (1985) and Singhal et al., FASEB J. 1:220 (1987)). Hydroxyl protecting groups include esters, carbonates and carbamate protecting groups. Amine protecting groups include alkoxy and aryloxy carbonyl groups, as described above for N-terminal protecting groups. Carboxylic acid protecting groups include aliphatic, benzylic and aryl esters, as described above for C-terminal protecting groups. In one embodiment, the carboxylic acid group in the side chain of one or more glutamic acid or aspartic acid residue in a composition of the present invention is protected, preferably with a methyl, ethyl, benzyl or substituted benzyl ester, more preferably as a benzyl ester.

Non-limiting, illustrative examples of N-terminal protecting groups include acyl groups (—CO—R1) and alkoxy carbonyl or aryloxy carbonyl groups (—CO—O—R1), wherein R1 is an aliphatic, substituted aliphatic, benzyl, substituted benzyl, aromatic or a substituted aromatic group. Specific examples of acyl groups include but are not limited to acetyl, (ethyl)-CO—, n-propyl-CO—, iso-propyl-CO—, n-butyl-CO—, sec-butyl-CO—, t-butyl-CO—, hexyl, lauroyl, palmitoyl, myristoyl, stearyl, oleoyl phenyl-CO—, substituted phenyl-CO—, benzyl-CO— and (substituted benzyl)-CO—. Examples of alkoxy carbonyl and aryloxy carbonyl groups include CH3-O—CO—, (ethyl)-O—CO—, n-propyl-O—CO—, iso-propyl-O—CO—, n-butyl-O—CO—, sec-butyl-O—CO—, t-butyl-O—CO—, phenyl-O—CO—, substituted phenyl-O—CO— and benzyl-O—CO—, (substituted benzyl)-O—CO—, Adamantan, naphtalene, myristoleyl, toluene, biphenyl, cinnamoyl, nitrobenzoy, toluoyl, furoyl, benzoyl, cyclohexane, norbornane, or Z-caproic. In order to facilitate the N-acylation, one to four glycine residues can be present in the N-terminus of the molecule.

The carboxyl group at the C-terminus of the compound can be protected, for example, by a group including but not limited to an amide (i.e., the hydroxyl group at the C-terminus is replaced with —NH₂, —NHR₂ and —NR₂R₃) or ester (i.e. the hydroxyl group at the C-terminus is replaced with —OR₂). R₂ and R₃ are optionally independently an aliphatic, substituted aliphatic, benzyl, substituted benzyl, aryl or a substituted aryl group. In addition, taken together with the nitrogen atom, R₂ and R₃ can optionally form a C4 to C8 heterocyclic ring with from about 0-2 additional heteroatoms such as nitrogen, oxygen or sulfur. Non-limiting suitable examples of suitable heterocyclic rings include piperidinyl, pyrrolidinyl, morpholino, thiomorpholino or piperazinyl. Examples of C-terminal protecting groups include but are not limited to —NH₂, —NHCH₃, —N(CH₃)₂—NH(ethyl), —N(ethyl)₂, —N(methyl) (ethyl), —NH(benzyl), —N(C1-C4 alkyl)(benzyl), —NH(phenyl), —N(C1-C4 alkyl) (phenyl), —OCH₃, —O-(ethyl), —O-(n-propyl), —O-(n-butyl), —O-(iso-propyl), —O-(sec-butyl), —O-(t-butyl), —O-benzyl and —O-phenyl.

Substitution by Peptidomimetic Moieties

A “peptidomimetic organic moiety” can optionally be substituted for amino acid residues in the composition of this invention both as conservative and as non-conservative substitutions. These moieties are also termed “non-natural amino acids” and may optionally replace amino acid residues, amino acids or act as spacer groups within the peptides in lieu of deleted amino acids. The peptidomimetic organic moieties optionally and preferably have steric, electronic or configurational properties similar to the replaced amino acid and such peptidomimetics are used to replace amino acids in the essential positions, and are considered conservative substitutions. However such similarities are not necessarily required. According to preferred embodiments of the present invention, one or more peptidomimetics are selected such that the composition at least substantially retains its physiological activity as compared to the native protein according to the present invention.

Peptidomimetics may optionally be used to inhibit degradation of the peptides by enzymatic or other degradative processes. The peptidomimetics can optionally and preferably be produced by organic synthetic techniques. Non-limiting examples of suitable peptidomimetics include D amino acids of the corresponding L amino acids, tetrazol (Zabrocki et al., J. Am. Chem. Soc. 110:5875-5880 (1988)); isosteres of amide bonds (Jones et al., Tetrahedron Lett. 29: 3853-3856 (1988)); LL-3-amino-2-propenidone-6-carboxylic acid (LL-Acp) (Kemp et al., J. Org. Chem. 50:5834-5838 (1985)). Similar analogs are shown in Kemp et al., Tetrahedron Lett. 29:5081-5082 (1988) as well as Kemp et al., Tetrahedron Lett. 29:5057-5060 (1988), Kemp et al., Tetrahedron Lett. 29:4935-4938 (1988) and Kemp et al., J. Org. Chem. 54:109-115 (1987). Other suitable but exemplary peptidomimetics are shown in Nagai and Sato, Tetrahedron Lett. 26:647-650 (1985); Di Maio et al., J. Chem. Soc. Perkin Trans., 1687 (1985); Kahn et al., Tetrahedron Lett. 30:2317 (1989); Olson et al., J. Am. Chem. Soc. 112:323-333 (1990); Garvey et al., J. Org. Chem. 56:436 (1990). Further suitable exemplary peptidomimetics include hydroxy-1,2,3,4-tetrahydroisoquinoline-3-carboxylate (Miyake et al., J. Takeda Res. Labs 43:53-76 (1989)); 1,2,3,4-tetrahydro-isoquinoline-3-carboxylate (Kazmierski et al., J. Am. Chem. Soc. 133:2275-2283 (1991)); histidine isoquinolone carboxylic acid (HIC) (Zechel et al., Int. J. Pep. Protein Res. 43 (1991)); (2S, 3S)-methyl-phenylalanine, (2S, 3R)-methyl-phenylalanine, (2R, 3S)-methyl-phenylalanine and (2R, 3R)-methyl-phenylalanine (Kazmierski and Hruby, Tetrahedron Lett. (1991)).

Exemplary, illustrative but non-limiting non-natural amino acids include beta-amino acids (beta3 and beta2), homo-amino acids, cyclic amino acids, aromatic amino acids, Pro and Pyr derivatives, 3-substituted Alanine derivatives, Glycine derivatives, ring-substituted Phe and Tyr Derivatives, linear core amino acids or diamino acids. They are available from a variety of suppliers, such as Sigma-Aldrich (USA) for example.

Protein Chemical Modifications

In the present invention any part of a protein according to at least some embodiments of the invention may optionally be chemically modified, i.e. changed by addition of functional groups. For example the side amino acid residues appearing in the native sequence may optionally be modified, although as described below alternatively other parts of the protein may optionally be modified, in addition to or in place of the side amino acid residues. The modification may optionally be performed during synthesis of the molecule if a chemical synthetic process is followed, for example by adding a chemically modified amino acid. However, chemical modification of an amino acid when it is already present in the molecule (“in situ” modification) is also possible.

The amino acid of any of the sequence regions of the molecule can optionally be modified according to any one of the following exemplary types of modification (in the peptide conceptually viewed as “chemically modified”). Non-limiting exemplary types of modification include carboxymethylation, acylation, phosphorylation, glycosylation or fatty acylation. Ether bonds can optionally be used to join the serine or threonine hydroxyl to the hydroxyl of a sugar. Amide bonds can optionally be used to join the glutamate or aspartate carboxyl groups to an amino group on a sugar (Garg and Jeanloz, Advances in Carbohydrate Chemistry and Biochemistry, Vol. 43, Academic Press (1985); Kunz, Ang. Chem. Int. Ed. English 26:294-308 (1987)). Acetal and ketal bonds can also optionally be formed between amino acids and carbohydrates. Fatty acid acyl derivatives can optionally be made, for example, by acylation of a free amino group (e.g., lysine) (Toth et al., Peptides: Chemistry, Structure and Biology, Rivier and Marshal, eds., ESCOM Publ., Leiden, 1078-1079 (1990)).

As used herein the term “chemical modification”, when referring to a protein or peptide according to the present invention, refers to a protein or peptide where at least one of its amino acid residues is modified either by natural processes, such as processing or other post-translational modifications, or by chemical modification techniques which are well known in the art. Examples of the numerous known modifications typically include, but are not limited to: acetylation, acylation, amidation, ADP-ribosylation, glycosylation, GPI anchor formation, covalent attachment of a lipid or lipid derivative, methylation, myristylation, pegylation, prenylation, phosphorylation, ubiquitination, or any similar process.

Other types of modifications optionally include the addition of a cycloalkane moiety to a biological molecule, such as a protein, as described in PCT Application No. WO 2006/050262, hereby incorporated by reference as if fully set forth herein. These moieties are designed for use with biomolecules and may optionally be used to impart various properties to proteins.

Furthermore, optionally any point on a protein may be modified. For example, pegylation of a glycosylation moiety on a protein may optionally be performed, as described in PCT Application No. WO 2006/050247, hereby incorporated by reference as if fully set forth herein. One or more polyethylene glycol (PEG) groups may optionally be added to O-linked and/or N-linked glycosylation. The PEG group may optionally be branched or linear. Optionally any type of water-soluble polymer may be attached to a glycosylation site on a protein through a glycosyl linker.

Altered Glycosylation

Proteins according to at least some embodiments of the invention may be modified to have an altered glycosylation pattern (i.e., altered from the original or native glycosylation pattern). As used herein, “altered” means having one or more carbohydrate moieties deleted, and/or having at least one glycosylation site added to the original protein.

Glycosylation of proteins is typically either N-linked or O-linked. N-linked refers to the attachment of the carbohydrate moiety to the side chain of an asparagine residue. The tripeptide sequences, asparagine-X-serine and asparagine-X-threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain. Thus, the presence of either of these tripeptide sequences in a polypeptide creates a potential glycosylation site. O-linked glycosylation refers to the attachment of one of the sugars N-acetylgalactosamine, galactose, or xylose to a hydroxyamino acid, most commonly serine or threonine, although 5-hydroxyproline or 5-hydroxylysine may also be used.

Addition of glycosylation sites to proteins according to at least some embodiments of the invention is conveniently accomplished by altering the amino acid sequence of the protein such that it contains one or more of the above-described tripeptide sequences (for N-linked glycosylation sites). The alteration may also be made by the addition of, or substitution by, one or more serine or threonine residues in the sequence of the original protein (for O-linked glycosylation sites). The protein's amino acid sequence may also be altered by introducing changes at the DNA level.

Another means of increasing the number of carbohydrate moieties on proteins is by chemical or enzymatic coupling of glycosides to the amino acid residues of the protein. Depending on the coupling mode used, the sugars may be attached to (a) arginine and histidine, (b) free carboxyl groups, (c) free sulfhydryl groups such as those of cysteine, (d) free hydroxyl groups such as those of serine, threonine, or hydroxyproline, (e) aromatic residues such as those of phenylalanine, tyrosine, or tryptophan, or (f) the amide group of glutamine. These methods are described in WO 87/05330, and in Aplin and Wriston, CRC Crit. Rev. Biochem., 22: 259-306 (1981).

Removal of any carbohydrate moieties present on proteins according to at least some embodiments of the invention may be accomplished chemically or enzymatically. Chemical deglycosylation requires exposure of the protein to trifluoromethanesulfonic acid, or an equivalent compound. This treatment results in the cleavage of most or all sugars except the linking sugar (N-acetylglucosamine or N-acetylgalactosamine), leaving the amino acid sequence intact.

Chemical deglycosylation is described by Hakimuddin et al., Arch. Biochem. Biophys., 259: 52 (1987); and Edge et al., Anal. Biochem., 118: 131 (1981). Enzymatic cleavage of carbohydrate moieties on proteins can be achieved by the use of a variety of endo- and exo-glycosidases as described by Thotakura et al., Meth. Enzymol., 138: 350 (1987).

Methods of Use

As used herein “therapeutic agent” is any one of the LY6G6F, VSIG10, TMEM25 and/or LSR proteins and polypeptides according to at least some embodiments of the present invention, or orthologs, or fragments thereof, especially the ectodomain or secreted forms of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, and/or fusion protein, and/or multimeric protein containing same, or nucleic acid sequence or fragments thereof of LY6G6F, VSIG10, TMEM25 and/or LSR, as well as drugs which specifically bind to the LY6G6F, VSIG10, TMEM25 and/or LSR proteins, and/or drugs which agonize or antagonize the binding of other moieties to the LY6G6F, VSIG10, TMEM25 and/or LSR proteins, and/or drugs which modulate (agonize or antagonize) at least one LY6G6F, VSIG10, TMEM25 and/or LSR related biological activity. Such drugs include monoclonal and/or polyclonal antibodies, and/or antigen binding fragments, and/or conjugates containing same, and/or alternative scaffolds, thereof comprising an antigen binding site that binds specifically to any one of the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides or an epitope thereof. Such drugs by way of example also include small molecules, peptides, ribozymes, aptamers, antisense molecules, siRNA's and the like.

Stimulation of activity of LY6G6F, VSIG10, TMEM25 and/or LSR is desirable in situations in which LY6G6F, VSIG10, TMEM25 and/or LSR is abnormally downregulated, and/or situations in which increased activity of LY6G6F, VSIG10, TMEM25 and/or LSR is likely to have a beneficial effect. Likewise, inhibition of activity of LY6G6F, VSIG10, TMEM25 and/or LSR is desirable in situations in which LY6G6F, VSIG10, TMEM25 and/or LSR is abnormally upregulated, and/or situations in which decreased activity of LY6G6F, VSIG10, TMEM25 and/or LSR is likely to have beneficial effect.

As mentioned herein above, the therapeutic agents can be used to treat immune related disorders as recited herein, and/or autoimmune disorders as recited herein, and/or infectious disorders as recited herein, and/or cancer as recited herein and/or for blocking and/or promoting immune costimulation mediated by any one of the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptides.

According to an additional aspect of the present invention the therapeutic agents can be used to prevent pathologic inhibition of T cell activity, such as that directed against cancer cells or chronic infections; and/or prevent pathologic stimulation of T cell activity, such as that directed against autoantigens in autoimmune diseases. For example, these molecules can be administered to cells in culture, in vitro or ex vivo, or to human subjects, e.g., in vivo, to treat, prevent and to diagnose a variety of disorders. Preferred subjects include human patients, having disorders mediated by cells expressing the LY6G6F, VSIG10, TMEM25 and/or LSR protein, and cells that possess LY6G6F, VSIG10, TMEM25 and/or LSR activity.

According to an additional aspect of the present invention the therapeutic agents can be used to inhibit T cell activation, as can be manifested for example by T cell proliferation and cytokine secretion.

According to an additional aspect of the present invention the therapeutic agents can be used to elicit in vivo or in vitro one or more of the following biological activities: to inhibit the growth of and/or kill a cell expressing LY6G6F, VSIG10, TMEM25 and/or LSR; to mediate phagocytosis or ADCC of a cell expressing LY6G6F, VSIG10, TMEM25 and/or LSR in the presence of human effector cells, or to block LY6G6F, VSIG10, TMEM25 and/or LSR ligand binding to LY6G6F, VSIG10, TMEM25 and/or LSR, respectively.

Thus, according to an additional aspect of the present invention there is provided a method of treating immune related disorders as recited herein, and/or autoimmune disorders as recited herein, and/or infectious disorders as recited herein, and/or cancer as recited herein, and/or for blocking or promoting immune stimulation mediated by the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide in a subject by administering to a subject in need thereof an effective amount of any one of the therapeutic agents and/or a pharmaceutical composition comprising any of the therapeutic agents and further comprising a pharmaceutically acceptable diluent or carrier.

The subject according to the present invention is a mammal, preferably a human which is diagnosed with one of the disease, disorder or conditions described hereinabove, or alternatively is predisposed to at least one type of cancer and/or infectious disorders, and/or immune related disorder.

As used herein the term “treating” refers to preventing, delaying the onset of, curing, reversing, attenuating, alleviating, minimizing, suppressing or halting the deleterious effects of the above-described diseases, disorders or conditions. It also includes managing the disease as described above. By “manage” it is meant reducing the severity of the disease, reducing the frequency of episodes of the disease, reducing the duration of such episodes, reducing the severity of such episodes and the like.

Treating, according to the present invention, can be effected by specifically upregulating the expression of at least one of the polypeptides of the present invention in the subject.

It will be appreciated that treatment of the above-described diseases according to the present invention may be combined with other treatment methods known in the art (i.e., combination therapy). Thus the therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, according to at least some embodiments of the present invention can also be used in combination with one or more of the following agents to regulate an immune response: soluble gp39 (also known as CD40 ligand (CD40L), CD154, T-BAM, TRAP), soluble CD29, soluble CD40, soluble CD80 (e.g. ATCC 68627), soluble CD86, soluble CD28 (e.g. 68628), soluble CD56, soluble Thy-1, soluble CD3, soluble TCR, soluble VLA-4, soluble VCAM-1, soluble LECAM-1, soluble ELAM-1, soluble CD44, antibodies reactive with gp39 (e.g. ATCC HB-10916, ATCC HB-12055 and ATCC HB-12056), antibodies reactive with CD40 (e.g. ATCC HB-9110), antibodies reactive with B7 (e.g. ATCC HB-253, ATCC CRL-2223, ATCC CRL-2226, ATCC HB-301, ATCC HB-11341, etc), antibodies reactive with CD28 (e.g. ATCC HB-11944 or mAb 9.3), antibodies reactive with LFA-1 (e.g. ATCC HB-9579 and ATCC TIB-213), antibodies reactive with LFA-2, antibodies reactive with IL-2, antibodies reactive with IL-12, antibodies reactive with IFN-gamma, antibodies reactive with CD2, antibodies reactive with CD48, antibodies reactive with any ICAM (e.g., ICAM-1 (ATCC CRL-2252), ICAM-2 and ICAM-3), antibodies reactive with CTLA4 (e.g. ATCC HB-304), antibodies reactive with Thy-1, antibodies reactive with CD56, antibodies reactive with CD3, antibodies reactive with CD29, antibodies reactive with TCR, antibodies reactive with VLA-4, antibodies reactive with VCAM-1, antibodies reactive with LECAM-1, antibodies reactive with ELAM-1, antibodies reactive with CD44; L104EA29YIg, CD80 monoclonal antibodies (mAbs), CD86 mAbs, gp39 mAbs, CD40 mAbs, CD28 mAbs; anti-LFA1 mAbs, antibodies or other agents targeting mechanisms of the immune system such as CD52 (alemtuzumab), CD25 (daclizumab), VLA-4 (natalizumab), CD20 (rituximab), IL2R (daclizumab) and MS4A1 (ocrelizumab); novel oral immunomodulating agents have shown to prevent lymphocyte recirculation from lymphoid organs such as fingolimod (FTY720) or leading to lymphocyte depletion such as mylinax (oral cladribine) or teriflunomide; and agents that prevent immunoactivation such as panaclar (dimethyl fumarate BG-12) or laquinimod (ABR216062). Other combinations will be readily appreciated and understood by persons skilled in the art. In some embodiments, the therapeutic agents can be used to attenuate or reverse the activity of a pro-inflammatory drug, and/or limit the adverse effects of such drugs.

As persons skilled in the art will readily understand, the combination can include the therapeutic agents and/or a pharmaceutical composition comprising same, according to at least some embodiments of the invention and one other immunosuppressive agent; the therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, with two other immunosuppressive agents, the therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, with three other immunosuppressive agents, etc. The determination of the optimal combination and dosages can be determined and optimized using methods well known in the art.

The therapeutic agent according to the present invention and one or more other therapeutic agents can be administered in either order or simultaneously. The other therapeutic agents are for example, a cytotoxic agent, a radiotoxic agent or an immunosuppressive agent. The composition can be linked to the agent (as an immunocomplex) or can be administered separately from the agent. In the latter case (separate administration), the composition can be administered before, after or concurrently with the agent or can be co-administered with other known therapies, e.g., an anti-cancer therapy, e.g., radiation. Such therapeutic agents include, among others, anti-neoplastic agents such as doxorubicin (adriamycin), cisplatin bleomycin sulfate, carmustine, chlorambucil, and cyclophosphamide hydroxyurea which, by themselves, are only effective at levels which are toxic or subtoxic to a patient. Cisplatin is intravenously administered as a 100 mg/dose once every four weeks and adriamycin is intravenously administered as a 60-75 mg/ml dose once every 21 days.

Co-administration of the human anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies, or antigen binding fragments thereof, according to at least some embodiments of the present invention with chemotherapeutic agents provides two anti-cancer agents which operate via different mechanisms which yield a cytotoxic effect to human tumor cells. Such co-administration can solve problems due to development of resistance to drugs or a change in the antigenicity of the tumor cells which would render them unreactive with the antibody. Target-specific effector cells, e.g., effector cells linked to compositions (e.g., human antibodies, multispecific and bispecific molecules) according to at least some embodiments of the invention can also be used as therapeutic agents. Effector cells for targeting can be human leukocytes such as macrophages, neutrophils or monocytes. Other cells include eosinophils, natural killer cells and other IgG- or IgA-receptor bearing cells. If desired, effector cells can be obtained from the subject to be treated. The target-specific effector cells can be administered as a suspension of cells in a physiologically acceptable solution. The number of cells administered can be in the order of 10-8 to 10-9 but will vary depending on the therapeutic purpose. In general, the amount will be sufficient to obtain localization at the target cell, e.g., a tumor cell expressing LY6G6F, VSIG10, TMEM25 and/or LSR proteins, and to effect cell killing by, e.g., phagocytosis. Routes of administration can also vary.

Therapy with target-specific effector cells can be performed in conjunction with other techniques for removal of targeted cells. For example, anti-tumor therapy using the compositions (e.g., human antibodies, multispecific and bispecific molecules) according to at least some embodiments of the invention and/or effector cells armed with these compositions can be used in conjunction with chemotherapy. Additionally, combination immunotherapy may be used to direct two distinct cytotoxic effector populations toward tumor cell rejection. For example, anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies linked to anti-Fc-gamma RI or anti-CD3 may be used in conjunction with IgG- or IgA-receptor specific binding agents.

Bispecific and multispecific molecules according to at least some embodiments of the invention can also be used to modulate FcgammaR or FcgammaR levels on effector cells, such as by capping and elimination of receptors on the cell surface. Mixtures of anti-Fc receptors can also be used for this purpose.

The invention also encompasses the use of the compositions according to at least some embodiments of the invention in combination with other pharmaceutical agents to treat immune system diseases. For example, autoimmune disease may be treated with molecules according to at least some embodiments of the invention in conjunction with, but not limited to, immunosuppressants such as corticosteroids, cyclosporin, cyclophosphamide, prednisone, azathioprine, methotrexate, rapamycin, tacrolimus, biological agents such as TNF-alpha blockers or antagonists, or any other biological agent targeting any inflammatory cytokine, nonsteroidal antiinflammatory drugs/Cox-2 inhibitors, hydroxychloroquine, sulphasalazopryine, gold salts, etanercept, infliximab, mycophenolate mofetil, basiliximab, atacicept, rituximab, cytoxan, interferon beta-1a, interferon beta-1b, glatiramer acetate, mitoxantrone hydrochloride, anakinra and/or other biologics and/or intravenous immunoglobulin (IVIG). Non-limiting examples of such known therapeutics include interferons, such as IFN-beta-1a (REBIF®. AVONEX® and CINNOVEX®) and IFN-beta-1b (BETASERON®, EXTAVIA®, BETAFERON®, ZIFERON®); glatiramer acetate (COPAXONE®), a polypeptide; natalizumab (TYSABRI®); and mitoxantrone (NOVANTRONE®), a cytotoxic agent.

Thus, treatment of multiple sclerosis using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating multiple sclerosis. Non-limiting examples of such known therapeutic agent or method for treating multiple sclerosis include interferon class, IFN-beta-1a (REBIF®. AVONEX® and CINNOVEX®) and IFN-beta-1b (BETASERON®, EXTAVIA®, BETAFERON®, ZIFERON®); glatiramer acetate (COPAXONE®), a polypeptide; natalizumab (TYSABRI®); and mitoxantrone (NOVANTRONE®), a cytotoxic agent, Fampridine (AMPYRA®). Other drugs include corticosteroids, methotrexate, cyclophosphamide, azathioprine, and intravenous immunoglobulin (IVIG), inosine, Ocrelizumab (R1594), Mylinax (Caldribine), alemtuzumab (Campath), daclizumab (Zenapax), Panaclar/dimethyl fumarate (BG-12), Teriflunomide (HMR1726), fingolimod (FTY720), laquinimod (ABR216062), as well as Haematopoietic stem cell transplantation, Neurovax, Rituximab (Rituxan) BCG vaccine, low dose naltrexone, helminthic therapy, angioplasty, venous stents, and alternative therapy, such as vitamin D, polyunsaturated fats, medical marijuana.

Thus, treatment of rheumatoid arthritis, using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating rheumatoid arthritis. Non-limiting examples of such known therapeutic agents or methods for treating rheumatoid arthritis include glucocorticoids, nonsteroidal anti-inflammatory drug (NSAID) such as salicylates, or cyclooxygenase-2 inhibitors, ibuprofen and naproxen, diclofenac, indomethacin, etodolac Disease-modifying antirheumatic drugs (DMARDs)—Oral DMARDs: Auranofin (Ridaura), Azathioprine (Imuran), Cyclosporine (Sandimmune, Gengraf, Neoral, generic), D-Penicillamine (Cuprimine), Hydroxychloroquine (Plaquenil), IM gold Gold sodium thiomalate (Myochrysine) Aurothioglucose (Solganal), Leflunomide (Arava), Methotrexate (Rheumatrex), Minocycline (Minocin), Staphylococcal protein A immunoadsorption (Prosorba column), Sulfasalazine (Azulfidine). Biologic DMARDs: TNF-α blockers including Adalimumab (Humira), Etanercept (Enbrel), Infliximab (Remicade), golimumab (Simponi), certolizumab pegol (Cimzia), and other Biological DMARDs, such as Anakinra (Kineret), Rituximab (Rituxan), Tocilizumab (Actemra), CD28 inhibitor including Abatacept (Orencia) and Belatacept.

Thus, treatment of IBD, using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating IBD. Non-limiting examples of such known therapeutic agents or methods for treating IBD include immunosuppression to control the symptom, such as prednisone, Mesalazine (including Asacol, Pentasa, Lialda, Aspiro), azathioprine (Imuran), methotrexate, or 6-mercaptopurine, steroids, Ondansetron, TNF-α blockers (including infliximab, adalimumab golimumab, certolizumab pegol), Orencia (abatacept), ustekinumab (Stelara®), Briakinumab (ABT-874), Certolizumab pegol (Cimzia®), ITF2357 (givinostat), Natalizumab (Tysabri), Firategrast (SB-683699), Remicade (infliximab), vedolizumab (MLN0002), other drugs including GSK1605786 CCX282-B (Traficet-EN), AJM300, Stelara (ustekinumab), Semapimod (CNI-1493) tasocitinib (CP-690550), LMW Heparin MMX, Budesonide MMX, Simponi (golimumab), MultiStem®, Gardasil HPV vaccine, Epaxal Berna (virosomal hepatitis A vaccine), surgery, such as bowel resection, strictureplasty or a temporary or permanent colostomy or ileostomy; antifungal drugs such as nystatin (a broad spectrum gut antifungal) and either itraconazole (Sporanox) or fluconazole (Diflucan); alternative medicine, prebiotics and probiotics, cannabis, Helminthic therapy or ova of the Trichuris suis helminth.

Thus, treatment of psoriasis, using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating psoriasis. Non-limiting examples of such known therapeutics for treating psoriasis include topical agents, typically used for mild disease, phototherapy for moderate disease, and systemic agents for severe disease. Non-limiting examples of topical agents: bath solutions and moisturizers, mineral oil, and petroleum jelly; ointment and creams containing coal tar, dithranol (anthralin), corticosteroids like desoximetasone (Topicort), Betamethasone, fluocinonide, vitamin D3 analogues (for example, calcipotriol), and retinoids. Non-limiting examples of phototherapy: sunlight; wavelengths of 311-313 nm, psoralen and ultraviolet A phototherapy (PUVA). Non-limiting examples of systemic agents: Biologics, such as interleukin antagonists, TNF-α blockers including antibodies such as infliximab (Remicade), adalimumab (Humira), golimumab, certolizumab pegol, and recombinant TNF-α decoy receptor, etanercept (Enbrel); drugs that target T cells, such as efalizumab (Xannelim/Raptiva), alefacept (Ameviv), dendritic cells such Efalizumab; monoclonal antibodies (MAbs) targeting cytokines, including anti-IL-12/IL-23 (ustekinumab (brand name Stelara)) and anti-Interleukin-17; Briakinumab (ABT-874); small molecules, including but not limited to ISA247; Immunosuppressants, such as methotrexate, cyclosporine; vitamin A and retinoids (synthetic forms of vitamin A); and alternative therapy, such as changes in diet and lifestyle, fasting periods, low energy diets and vegetarian diets, diets supplemented with fish oil rich in Vitamin A and Vitamin D (such as cod liver oil), Fish oils rich in the two omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) and contain Vitamin E. Ichthyotherapy, Hypnotherapy, cannabis.

Thus, treatment of type 1 diabetes, using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating type 1 diabetes. Non-limiting examples of such known therapeutics for treating type 1 diabetes include insulin, insulin analogs, islet transplantation, stem cell therapy including PROCHYMAL®, non-insulin therapies such as it-1 beta inhibitors including Anakinra (Kineret®), Abatacept (Orencia®), Diamyd, alefacept (Ameviv®), Otelixizumab, DiaPep277 (Hsp60 derived peptide), Alpha 1-Antitrypsin, Prednisone, azathioprine, Ciclosporin, El-INT (an injectable islet neogenesis therapy comprising an epidermal growth factor analog and a gastrin analog), statins including Zocor®, Simlup®, Simcard®, Simvacor®, Sitagliptin (dipeptidyl peptidase (DPP-4) inhibitor), Anti-CD3 mAb (e.g., Teplizumab); CTLA4-Ig (abatacept), Anti IL-1Beta (Canakinumab), Anti-CD20 mAb (e.g, rituximab).

Thus, treatment of uveitis, using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating uveitis. Non-limiting examples of such known therapeutics for treating uveitis include corticosteroids, topical cycloplegics, such as atropine or homatropine, or injection of PSTTA (posterior subtenon triamcinolone acetate), antimetabolite medications, such as methotrexate, TNF-α blockers (including infliximab, adalimumab, etanercept, golimumab, certolizumab pegol).

Thus, treatment for Sjogren's syndrome, using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating for Sjogren's syndrome. Non-limiting examples of such known therapeutics for treating for Sjogren's syndrome include Cyclosporine, pilocarpine (Salagen) and cevimeline (Evoxac), Hydroxychloroquine (Plaquenil), cortisone (prednisone and others) and/or azathioprine (Imuran) or cyclophosphamide (Cytoxan), Dexamethasone, Thalidomide, Dehydroepiandrosterone, NGX267, Rebamipide, FID 114657, Etanercept, Raptiva, Belimumab, MabThera (rituximab); Anakinra, intravenous immune globulin (IVIG), Allogeneic Mesenchymal Stem Cells (AlloMSC), Automatic neuro-electrostimulation by “Saliwell Crown”.

Thus, treatment for systemic lupus erythematosus, using the agents according to at least some embodiments of the present invention may be combined with, for example, any known therapeutic agent or method for treating for systemic lupus erythematosus. Non-limiting examples of such known therapeutics for treating for systemic lupus erythematosus include corticosteroids and Disease-modifying antirheumatic drugs (DMARDs), commonly anti-malarial drugs such as plaquenil and immunosuppressants (e.g. methotrexate and azathioprine) Hydroxychloroquine, cytotoxic drugs (e.g., cyclophosphamide and mycophenolate), Hydroxychloroquine (HCQ), Benlysta (belimumab), nonsteroidal anti-inflammatory drugs, Prednisone, Cellcept, Prograf, Atacicept, Lupuzor, Intravenous Immunoglobulins (IVIGs), CellCept (mycophenolate mofetil), Orencia, CTLA4-IgG4m (RG2077), rituximab, Ocrelizumab, Epratuzumab, CNTO 136, Sifalimumab (MEDI-545), A-623 (formerly AMG 623), AMG 557, Rontalizumab, paquinimod (ABR-215757), LY2127399, CEP-33457, Dehydroepiandrosterone, Levothyroxine, abetimus sodium (LJP 394), Memantine, Opiates, Rapamycin, Renal transplantation, stem cell transplantation.

The therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, according to at least some embodiments of the invention, may be administered as the sole active ingredient or together with other drugs in immunomodulating regimens or other anti-inflammatory agents e.g. for the treatment or prevention of allo- or xenograft acute or chronic rejection or inflammatory or autoimmune disorders, or to induce tolerance.

For example, it may be used in combination with a calcineurin inhibitor, e.g. cyclosporin A or FK506; an immunosuppressive macrolide, e.g. rapamycine or a derivative thereof; e.g. 40-O-(2-hydroxy)ethyl-rapamycin, a lymphocyte homing agent, e.g. FTY720 or an analog thereof, corticosteroids; cyclophosphamide; azathioprene; methotrexate; leflunomide or an analog thereof; mizoribine; mycophenolic acid; mycophenolate mofetil; 15-deoxyspergualine or an analog thereof; immunosuppressive monoclonal antibodies, e.g., monoclonal antibodies to leukocyte receptors, e.g., MHC, CD2, CD3, CD4, CD 11a/CD18, CD7, CD25, CD 27, B7, CD40, CD45, CD58, CD 137, ICOS, CD150 (SLAM), OX40, 4-1BB or their ligands; or other immunomodulatory compounds, e.g. CTLA4-Ig (abatacept, ORENCIA® or belatacept), CD28-Ig, B7-H4-Ig, or other costimulatory agents, or adhesion molecule inhibitors, e.g. mAbs or low molecular weight inhibitors including LFA-1 antagonists, Selectin antagonists and VLA-4 antagonists.

Where the therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, according to at least some embodiments of the invention are administered in conjunction with other immunosuppressive/immunomodulatory or anti-inflammatory therapy, e.g. as herein above specified, dosages of the co-administered immunosuppressant, immunomodulatory or anti-inflammatory compound will of course vary depending on the type of co-drug employed, e.g. whether it is a steroid or a cyclosporin, on the specific drug employed, on the condition being treated and so forth.

Treatment of malignancies using the agents of the present invention may be combined with other treatment methods known in the art, one or more of, for example, radiation therapy, antibody therapy, chemotherapy, photodynamic therapy, surgery or in combination therapy with conventional drugs, such as immunosuppressants or cytotoxic drugs.

A therapeutic agent or pharmaceutical composition according to at least some embodiments of the present invention may also be administered in conjunction with other compounds or immunotherapies. For example, the combination therapy can include a compound of the present invention combined with at least one other therapeutic or immune modulatory agent, or immunostimulatory strategy, including, but not limited to, tumor vaccines, adoptive T cell therapy, Treg depletion, antibodies (e.g. bevacizumab, erbitux), peptides, peptibodies, small molecules, chemotherapeutic agents such as cytotoxic and cytostatic agents (e.g. paclitaxel, cisplatin, vinorelbine, docetaxel, gemcitabine, temozolomide, irinotecan, 5FU, carboplatin), immunological modifiers such as interferons and interleukins, immunostimulatory antibodies, growth hormones or other cytokines, folic acid, vitamins, minerals, aromatase inhibitors, RNAi, Histone Deacetylase Inhibitors, proteasome inhibitors, and so forth.

According to at least some embodiments of the present invention, there is provided use of a combination of the therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, and a known therapeutic agent effective for treating infection.

The therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, can be administered in combination with one or more additional therapeutic agents used for treatment of bacterial infections, including, but not limited to, antibiotics including Aminoglycosides, Carbapenems, Cephalosporins, Macrolides, Lincosamides, Nitrofurans, penicillins, Polypeptides, Quinolones, Sulfonamides, Tetracyclines, drugs against mycobacteria including but not limited to Clofazimine, Cycloserine, Cycloserine, Rifabutin, Rifapentine, Streptomycin and other antibacterial drugs such as Chloramphenicol, Fosfomycin, Metronidazole, Mupirocin, and Tinidazole.

The therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, can be administered in combination with one or more additional therapeutic agents used for treatment of viral infections, including, but not limited to, antiviral drugs such as oseltamivir (brand name Tamiflu) and zanamivir (brand name Relenza) Arbidol—adamantane derivatives (Amantadine, Rimantadine)—neuraminidase inhibitors (Oseltamivir, Laninamivir, Peramivir, Zanamivir) nucleotide analog reverse transcriptase inhibitor including Purine analogue guanine (Aciclovir #/Valacyclovir, Ganciclovir/Valganciclovir, Penciclovir/Famciclovir) and adenine (Vidarabine), Pyrimidine analogue, uridine (Idoxuridine, Trifluridine, Edoxudine), thymine (Brivudine), cytosine (Cytarabine); Foscarnet; Nucleoside analogues/NARTIs: Entecavir, Lamivudine, Telbivudine, Clevudine; Nucleotide analogues/NtRTIs: Adefovir, Tenofovir; Nucleic acid inhibitors such as Cidofovir; InterferonInterferon alfa-2b, Peginterferon alfa-2a; Ribavirin #/Taribavirin; antiretroviral drugs including zidovudine, lamivudine, abacavir, lopinavir, ritonavir, tenofovir/emtricitabine, efavirenz each of them alone or a various combinations, gp41 (Enfuvirtide), Raltegravir, protease inhibitors such as Fosamprenavir, Lopinavir and Atazanavir, Methisazone, Docosanol, Fomivirsen, Tromantadine.

The therapeutic agents and/or a pharmaceutical composition comprising same, as recited herein, can be administered in combination with one or more additional therapeutic agents used for treatment of fungal infections, including, but not limited to, antifungal drugs of the Polyene antifungals, Imidazole, triazole, and thiazole antifungals, Allylamines, Echinocandins or other anti fungal drugs.

Alternatively or additionally, an upregulating method may optionally be effected by specifically upregulating the amount (optionally expression) in the subject of at least one of the polypeptides of the present invention or active portions thereof.

As is mentioned hereinabove and in the Examples section which follows, the biomolecular sequences of this aspect of the present invention may be used as valuable therapeutic tools in the treatment of diseases, disorders or conditions in which altered activity or expression of the wild-type gene product (known protein) is known to contribute to disease, disorder or condition onset or progression. For example, in case a disease is caused by overexpression of a membrane bound-receptor, a soluble variant thereof may be used as an antagonist which competes with the receptor for binding the ligand, to thereby terminate signaling from the receptor.

According to at least some embodiments, immune cells, preferably T cells, can be contacted in vivo or ex vivo with the therapeutic agents to modulate immune responses. The T cells contacted with the therapeutic agents can be any cell which expresses the T cell receptor, including α/β and γ/δ T cell receptors. T-cells include all cells which express CD3, including T-cell subsets which also express CD4 and CDS. T-cells include both naive and memory cells and effector cells such as CTL. T-cells also include cells such as Th1, Tc1, Th2, Tc2, Th3, Th17, Th22, Treg, and Tr1 cells. T-cells also include NKT-cells and similar unique classes of the T-cell lineage.

Inhibition of Epitope Spreading

Epitope spreading refers to the ability of B and T cell immune response to diversify both at the level of specificity, from a single determinant to many sites on an auto antigen, and at the level of V gene usage (Monneaux, F. et al., Arthritis &amp; Rheumatism, 46(6): 1430-1438 (2002). Epitope spreading is not restricted to systemic autoimmune disease. It has been described in T cell dependent organ specific diseases such as Diabetes mellitus type 1 and multiple sclerosis in humans, and EAE induced experimental animals with a variety of myelin proteins.

Epitope spreading involves the acquired recognition of new epitopes in the same self molecule as well as epitopes residing in proteins that are associated in the same macromolecular complex. Epitope spreading can be assessed by measuring delayed-type hypersensitivity (DTH) responses, methods of which are known in the art.

One embodiment provides a method for inhibiting or reducing epitope spreading in a subject by administering to the subject an effective amount of the therapeutic agents. In a further embodiment any one of the therapeutic agents inhibits epitope spreading in individuals with multiple sclerosis. Preferably, the therapeutic agents inhibit or block multiple points of the inflammation pathway.

Yet another embodiment provides a method for inhibiting or reducing epitope spreading in subjects with multiple sclerosis by administering to a subject an effective amount of the therapeutic agents to inhibit or reduce differentiation of, proliferation of, activity of, and/or cytokine production and/or secretion by Th1, Th17, Th22, and/or other cells that secrete, or cause other cells to secrete, inflammatory molecules, including, but not limited to, IL-1beta, TNF-alpha, TGF-beta, IFN-gamma, IL-17, IL-6, IL-23, IL-22, IL-21, and MMPs.

Use of the Therapeutic Agents According to at Least Some Embodiments of the Invention as Adjuvant for Cancer Vaccination:

Immunization against tumor-associated antigens (TAAs) is a promising approach for cancer therapy and prevention, but it faces several challenges and limitations, such as tolerance mechanisms associated with self-antigens expressed by the tumor cells. Costimulatory molecules such as B7.1 (CD80) and B7.2 (CD86) have improved the efficacy of gene-based and cell-based vaccines in animal models and are under investigation as adjuvant in clinical trials. This adjuvant activity can be achieved either by enhancing the costimulatory signal or by blocking inhibitory signal that is transmitted by negative costimulators expressed by tumor cells (Neighbors et al., 2008 J Immunother.; 31(7):644-55). According to at least some embodiments of the invention, any one of LY6G6F, VSIG10, TMEM25 and/or LSR secreted or soluble form or ECD and/or variants, and/or orthologs, and/or conjugates thereof, and/or a polyclonal or monoclonal antibody and/or antigen binding fragments and/or conjugates containing same, and/or alternative scaffolds, specific to any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, can be used as adjuvant for cancer vaccination. According to at least some embodiments, the invention provides methods for improving immunization against TAAs, comprising administering to a patient an effective amount of any one of LY6G6F, VSIG10, TMEM25 and/or LSR secreted or soluble form or ECD and/or variants, and/or orthologs, and/or conjugates thereof, and/or a polyclonal or monoclonal antibody and/or antigen binding fragments and/or conjugates containing same, and/or alternative scaffolds, specific to any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins.

Use of the Therapeutic Agents According to at Least Some Embodiments of the Invention for Adoptive Immunotherapy:

One of the cardinal features of some models of tolerance is that once the tolerance state has been established, it can be perpetuated to naive recipients by the adoptive transfer of donor-specific regulatory cells. Such adoptive transfer studies have also addressed the capacity of T-cell subpopulations and non-T cells to transfer tolerance. Such tolerance can be induced by blocking costimulation or upon engagement of a co-inhibitory B7 with its counter receptor. This approach, that have been successfully applied in animals and is evaluated in clinical trials in humans, (Scalapino K J and Daikh D I. PLoS One. 2009; 4(6):e6031; Riley et al., Immunity. 2009; 30(5): 656-665) provides a promising treatment option for autoimmune disorders and transplantation. According to at least some embodiments of the invention, LY6G6F, VSIG10, TMEM25 and/or LSR secreted or soluble form or ECD and/or variants, and/or orthologs, and/or conjugates thereof, and/or a polyclonal or monoclonal antibody and/or antigen binding fragments and/or conjugates containing same, and/or alternative scaffolds, specific to any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins are used for adoptive immunotherapy. Thus, according to at least some embodiments, the invention provides methods for in vivo or ex vivo tolerance induction, comprising administering effective amount of LY6G6F, VSIG10, TMEM25 and/or LSR secreted or soluble form or ECD and/or variants, and/or orthologs, and/or conjugates thereof, and/or a polyclonal or monoclonal antibody or and/or antigen binding fragments and/or conjugates containing same, and/or alternative scaffolds, specific to any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, to a patient or to leukocytes isolated from the patient, in order to induce differentiation of tolerogenic regulatory cells; followed by ex-vivo enrichment and expansion of said cells and reinfusion of the tolerogenic regulatory cells to said patient.

Alternatively, immune responses can be enhanced in a patient by removing immune cells from the patient, contacting immune cells in vitro with an agent that inhibits LY6G6F, VSIG10, TMEM25 and/or LSR activity, and/or which inhibits the interaction of LY6G6F, VSIG10, TMEM25 and/or LSR with their natural binding partners, and reintroducing the in vitro stimulated immune cells into the patient. In another embodiment, a method of modulating immune responses involves isolating immune cells from a patient, transfecting them with a nucleic acid molecule encoding a form of LY6G6F, VSIG10, TMEM25 and/or LSR, such that the cells express all or a portion of the LY6G6F, VSIG10, TMEM25 and/or LSR polypeptide according to various embodiments of the present invention on their surface, and reintroducing the transfected cells into the patient. The transfected cells have the capacity to modulate immune responses in the patient.

Use of the Therapeutic Agents According to at Least Some Embodiments of the Invention for Immunoenhancement

1. Treatment of Cancer

The therapeutic agents provided herein are generally useful in vivo and ex vivo as immune response-stimulating therapeutics. In general, the disclosed therapeutic agent compositions are useful for treating a subject having or being predisposed to any disease or disorder to which the subject's immune system mounts an immune response. The ability of therapeutic agents to modulate LY6G6F, VSIG10, TMEM25 and/or LSR immune signals enable a more robust immune response to be possible. The therapeutic agents according to at least some embodiments of the invention are useful to stimulate or enhance immune responses involving immune cells, such as T cells.

The therapeutic agents according to at least some embodiments of the invention are useful for stimulating or enhancing an immune response in host for treating cancer by administering to a subject an amount of a therapeutic agent effective to stimulate T cells in the subject.

2. Use of the Therapeutic Agents in Vaccines

The therapeutic agents according to at least some embodiments of the invention, are administered alone or in combination with any other suitable treatment. In one embodiment the therapeutic agents can be administered in conjunction with, or as a component of a vaccine composition as described above. The therapeutic agents according to at least some embodiments of the invention can be administered prior to, concurrently with, or after the administration of a vaccine. In one embodiment the therapeutic agents is administered at the same time as administration of a vaccine.

Pharmaceutical Compositions

In another aspect, the present invention provides a composition, e.g., a pharmaceutical composition, containing one or a combination of the therapeutic agent, according to at least some embodiments of the invention.

Thus, the present invention features a pharmaceutical composition comprising a therapeutically effective amount of a therapeutic agent according to at least some embodiments of the present invention.

The pharmaceutical composition according to at least some embodiments of the present invention is further preferably used for the treatment of cancer, wherein the cancer may be non-metastatic, invasive or metastatic, treatment of immune related disorder and/or infectious disorder.

“Treatment” refers to both therapeutic treatment and prophylactic or preventative measures. Those in need of treatment include those already with the disorder as well as those in which the disorder is to be prevented. Hence, the mammal to be treated herein may have been diagnosed as having the disorder or may be predisposed or susceptible to the disorder. “Mammal” for purposes of treatment refers to any animal classified as a mammal, including humans, domestic and farm animals, and zoo, sports, or pet animals, such as dogs, horses, cats, cows, etc. Preferably, the mammal is human.

The term “therapeutically effective amount” refers to an amount of agent according to the present invention that is effective to treat a disease or disorder in a mammal.

The therapeutic agents of the present invention can be provided to the subject alone, or as part of a pharmaceutical composition where they are mixed with a pharmaceutically acceptable carrier.

Pharmaceutical compositions according to at least some embodiments of the invention also can be administered in combination therapy, i.e., combined with other agents. For example, the combination therapy can include an anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibody or LY6G6F, VSIG10, TMEM25 and/or LSR modulating agent according to at least some embodiments of the present invention, such as a soluble polypeptide conjugate containing the ectodomain of the LY6G6F, VSIG10, TMEM25 and/or LSR antigen or a small molecule such as a peptide, ribozyme, aptamer, siRNA, or other drug that binds LY6G6F, VSIG10, TMEM25 and/or LSR, combined with at least one other therapeutic or immune modulatory agent.

A composition is said to be a “pharmaceutically acceptable carrier” if its administration can be tolerated by a recipient patient. As used herein, “pharmaceutically acceptable carrier” includes any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like that are physiologically compatible. Preferably, the carrier is suitable for intravenous, intramuscular, subcutaneous, parenteral, spinal or epidermal administration (e.g., by injection or infusion).

Such compositions include sterile water, buffered saline (e.g., Tris-HCl, acetate, phosphate), pH and ionic strength and optionally additives such as detergents and solubulizing agents (e.g., Polysorbate 20, Polysorbate 80), antioxidants (e.g, ascorbic acid, sodium metabisulfite), preservatives (e.g, Thimersol, benzyl alcohol) and bulking substances (e.g., lactose, manitol). Non-aqueous solvents or vehicles may also be used as detailed below.

Examples of suitable aqueous and nonaqueous carriers that may be employed in the pharmaceutical compositions according to at least some embodiments of the invention include water, ethanol, polyols (such as glycerol, propylene glycol, polyethylene glycol, and the like), and suitable mixtures thereof, vegetable oils, such as olive oil, and injectable organic esters, such as ethyl oleate. Proper fluidity can be maintained, for example, by the use of coating materials, such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants. Depending on the route of administration, the active compound, i.e., soluble polypeptide conjugate containing the ectodomain of the LY6G6F, VSIG10, TMEM25 and/or LSR antigen, monoclonal or polyclonal antibodies and antigen binding fragments and conjugates containing same, and/or alternative scaffolds, that specifically bind any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, or bispecific molecule, may be coated in a material to protect the compound from the action of acids and other natural conditions that may inactivate the compound. The pharmaceutical compounds according to at least some embodiments of the invention may include one or more pharmaceutically acceptable salts. A “pharmaceutically acceptable salt” refers to a salt that retains the desired biological activity of the parent compound and does not impart any undesired toxicological effects (see e.g., Berge, S. M., et al. (1977) J. Pharm. Sci. 66: 1-19). Examples of such salts include acid addition salts and base addition salts. Acid addition salts include those derived from nontoxic inorganic acids, such as hydrochloric, nitric, phosphoric, sulfuric, hydrobromic, hydroiodic, phosphorous and the like, as well as from nontoxic organic acids such as aliphatic mono- and dicarboxylic acids, phenyl-substituted alkanoic acids, hydroxy alkanoic acids, aromatic acids, aliphatic and aromatic sulfonic acids and the like. Base addition salts include those derived from alkaline earth metals, such as sodium, potassium, magnesium, calcium and the like, as well as from nontoxic organic amines, such as N,N′-dibenzylethylenediamine, N-methylglucamine, chloroprocaine, choline, diethanolamine, ethylenediamine, procaine and the like.

A pharmaceutical composition according to at least some embodiments of the invention also may include a pharmaceutically acceptable anti-oxidant. Examples of pharmaceutically acceptable antioxidants include: (1) water soluble antioxidants, such as ascorbic acid, cysteine hydrochloride, sodium bisulfate, sodium metabisulfite, sodium sulfite and the like; (2) oil-soluble antioxidants, such as ascorbyl palmitate, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), lecithin, propyl gallate, alpha-tocopherol, and the like; and (3) metal chelating agents, such as citric acid, ethylenediamine tetraacetic acid (EDTA), sorbitol, tartaric acid, phosphoric acid, and the like.

These compositions may also contain adjuvants such as preservatives, wetting agents, emulsifying agents and dispersing agents. Prevention of presence of microorganisms may be ensured both by sterilization procedures, supra, and by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include isotonic agents, such as sugars, sodium chloride, and the like into the compositions. In addition, prolonged absorption of the injectable pharmaceutical form may be brought about by the inclusion of agents which delay absorption such as aluminum monostearate and gelatin.

Pharmaceutically acceptable carriers include sterile aqueous solutions or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. The use of such media and agents for pharmaceutically active substances is known in the art. Except insofar as any conventional media or agent is incompatible with the active compound, use thereof in the pharmaceutical compositions according to at least some embodiments of the invention is contemplated. Supplementary active compounds can also be incorporated into the compositions.

Therapeutic compositions typically must be sterile and stable under the conditions of manufacture and storage. The composition can be formulated as a solution, microemulsion, liposome, or other ordered structure suitable to high drug concentration. The carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures thereof. The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants. In many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as mannitol, sorbitol, or sodium chloride in the composition. Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent that delays absorption, for example, monostearate salts and gelatin. Sterile injectable solutions can be prepared by incorporating the active compound in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by sterilization microfiltration. Generally, dispersions are prepared by incorporating the active compound into a sterile vehicle that contains a basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and freeze-drying (lyophilization) that yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.

Sterile injectable solutions can be prepared by incorporating the active compound in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by sterilization microfiltration. Generally, dispersions are prepared by incorporating the active compound into a sterile vehicle that contains a basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and freeze-drying (lyophilization) that yield a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.

The amount of active ingredient which can be combined with a carrier material to produce a single dosage form will vary depending upon the subject being treated, and the particular mode of administration. The amount of active ingredient which can be combined with a carrier material to produce a single dosage form will generally be that amount of the composition which produces a therapeutic effect. Generally, out of one hundred percent, this amount will range from about 0.01 percent to about ninety-nine percent of active ingredient, preferably from about 0.1 percent to about 70 percent, most preferably from about I percent to about 30 percent of active ingredient in combination with a pharmaceutically acceptable carrier.

Dosage regimens are adjusted to provide the optimum desired response (e.g., a therapeutic response). For example, a single bolus may be administered, several divided doses may be administered over time or the dose may be proportionally reduced or increased as indicated by the exigencies of the therapeutic situation. It is especially advantageous to formulate parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein refers to physically discrete units suited as unitary dosages for the subjects to be treated; each unit contains a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier. The specification for the dosage unit forms according to at least some embodiments of the invention are dictated by and directly dependent on (a) the unique characteristics of the active compound and the particular therapeutic effect to be achieved, and (b) the limitations inherent in the art of compounding such an active compound for the treatment of sensitivity in individuals.

For administration of the antibody, the dosage ranges from about 0.0001 to 100 mg/kg, and more usually 0.01 to 5 mg/kg, of the host body weight. For example dosages can be 0.3 mg/kg body weight, 1 mg/kg body weight, 3 mg/kg body weight, 5 mg/kg body weight or 10 mg/kg body weight or within the range of 1-10 mg/kg. An exemplary treatment regime entails administration once per week, once every two weeks, once every three weeks, once every four weeks, once a month, once every 3 months or once every three to 6 months. Preferred dosage regimens for an antibody according to at least some embodiments of the invention include 1 mg/kg body weight or 3 mg/kg body weight via intravenous administration, with the antibody being given using one of the following dosing schedules: (i) every four weeks for six dosages, then every three months; (ii) every three weeks; (iii) 3 mg/kg body weight once followed by 1 mg/kg body weight every three weeks.

For fusion proteins as described herein, optionally a similar dosage regimen is followed; alternatively, the fusion proteins may optionally be administered in an amount between 0.0001 to 100 mg/kg weight of the patient/day, preferably between 0.001 to 10.0 mg/kg/day, according to any suitable timing regimen. A therapeutic composition according to at least some embodiments of the invention can be administered, for example, three times a day, twice a day, once a day, three times weekly, twice weekly or once weekly, once every two weeks or 3, 4, 5, 6, 7 or 8 weeks. Moreover, the composition can be administered over a short or long period of time (e.g., 1 week, 1 month, 1 year, 5 years).

In some methods, two or more monoclonal antibodies with different binding specificities are administered simultaneously, in which case the dosage of each antibody administered falls within the ranges indicated. Antibody is usually administered on multiple occasions. Intervals between single dosages can be, for example, weekly, monthly, every three months or yearly. Intervals can also be irregular as indicated by measuring blood levels of antibody to the target antigen in the patient. In some methods, dosage is adjusted to achieve a plasma antibody concentration of about 1-1000 mug/ml and in some methods about 25-300.mu.g/ml.

Alternatively, therapeutic agent can be administered as a sustained release formulation, in which case less frequent administration is required. Dosage and frequency vary depending on the half-life of the therapeutic agent in the patient. In general, human antibodies show the longest half life, followed by humanized antibodies, chimeric antibodies, and nonhuman antibodies. The half-life for fusion proteins may vary widely. The dosage and frequency of administration can vary depending on whether the treatment is prophylactic or therapeutic. In prophylactic applications, a relatively low dosage is administered at relatively infrequent intervals over a long period of time. Some patients continue to receive treatment for the rest of their lives. In therapeutic applications, a relatively high dosage at relatively short intervals is sometimes required until progression of the disease is reduced or terminated, and preferably until the patient shows partial or complete amelioration of symptoms of disease. Thereafter, the patient can be administered a prophylactic regime.

Actual dosage levels of the active ingredients in the pharmaceutical compositions of the present invention may be varied so as to obtain an amount of the active ingredient which is effective to achieve the desired therapeutic response for a particular patient, composition, and mode of administration, without being toxic to the patient. The selected dosage level will depend upon a variety of pharmacokinetic factors including the activity of the particular compositions of the present invention employed, or the ester, salt or amide thereof, the route of administration, the time of administration, the rate of excretion of the particular compound being employed, the duration of the treatment, other drugs, compounds and/or materials used in combination with the particular compositions employed, the age, sex, weight, condition, general health and prior medical history of the patient being treated, and like factors well known in the medical arts.

A “therapeutically effective dosage” of LY6G6F, VSIG10, TMEM25 and/or LSR soluble protein or LY6G6F, VSIG10, TMEM25 and/or LSR ectodomain or fusion protein containing same, or an anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibody according to at least some embodiments of the invention preferably results in a decrease in severity of disease symptoms, an increase in frequency and duration of disease symptom-free periods, an increase in lifespan, disease remission, or a prevention or reduction of impairment or disability due to the disease affliction. For example, for the treatment of LY6G6F, VSIG10, TMEM25 and/or LSR positive tumors, e.g., melanoma, cancers of liver, renal, brain, breast, colon, lung, ovary, pancreas, prostate, stomach, multiple myeloma and hematopoietic cancer, including but not limited to lymphoma (Hodgkin's and non Hodgkin's), acute and chronic lymphoblastic leukemia and acute and chronic myeloid leukemia.], a “therapeutically effective dosage” preferably inhibits cell growth or tumor growth by at least about 20%, more preferably by at least about 40%, even more preferably by at least about 60%, and still more preferably by at least about 80% relative to untreated subjects. The ability of a compound to inhibit tumor growth can be evaluated in an animal model system predictive of efficacy in human tumors. Alternatively, this property of a composition can be evaluated by examining the ability of the compound to inhibit, such inhibition in vitro by assays known to the skilled practitioner. A therapeutically effective amount of a therapeutic compound can decrease tumor size, or otherwise ameliorate symptoms in a subject.

One of ordinary skill in the art would be able to determine a therapeutically effective amount based on such factors as the subject's size, the severity of the subject's symptoms, and the particular composition or route of administration selected.

A composition of the present invention can be administered via one or more routes of administration using one or more of a variety of methods known in the art. As will be appreciated by the skilled artisan, the route and/or mode of administration will vary depending upon the desired results. Preferred routes of administration for therapeutic agents according to at least some embodiments of the invention include intravascular delivery (e.g. injection or infusion), intravenous, intramuscular, intradermal, intraperitoneal, subcutaneous, spinal, oral, enteral, rectal, pulmonary (e.g. inhalation), nasal, topical (including transdermal, buccal and sublingual), intravesical, intravitreal, intraperitoneal, vaginal, brain delivery (e.g. intra-cerebroventricular, intra-cerebral, and convection enhanced diffusion), CNS delivery (e.g. intrathecal, perispinal, and intra-spinal) or parenteral (including subcutaneous, intramuscular, intravenous and intradermal), transmucosal (e.g., sublingual administration), administration or administration via an implant, or other parenteral routes of administration, for example by injection or infusion, or other delivery routes and/or forms of administration known in the art. The phrase “parenteral administration” as used herein means modes of administration other than enteral and topical administration, usually by injection, and includes, without limitation, intravenous, intramuscular, intraarterial, intrathecal, intracapsular, intraorbital, intracardiac, intradermal, intraperitoneal, transtracheal, subcutaneous, subcuticular, intraarticular, subcapsular, subarachnoid, intraspinal, epidural and intrasternal injection and infusion. In a specific embodiment, a protein, a therapeutic agent or a pharmaceutical composition according to at least some embodiments of the present invention can be administered intraperitoneally or intravenously.

Alternatively, an LY6G6F, VSIG10, TMEM25 and/or LSR specific antibody or other LY6G6F, VSIG10, TMEM25 and/or LSR drug or molecule and their conjugates and combinations thereof that modulates a LY6G6F, VSIG10, TMEM25 and/or LSR protein activity can be administered via a non-parenteral route, such as a topical, epidermal or mucosal route of administration, for example, intranasally, orally, vaginally, rectally, sublingually or topically.

The active compounds can be prepared with carriers that will protect the compound against rapid release, such as a controlled release formulation, including implants, transdermal patches, and microencapsulated delivery systems. Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Many methods for the preparation of such formulations are patented or generally known to those skilled in the art. See, e.g., Sustained and Controlled Release Drug Delivery Systems, J. R. Robinson, ed., Marcel Dekker, Inc., New York, 1978.

Therapeutic compositions can be administered with medical devices known in the art. For example, in a preferred embodiment, a therapeutic composition according to at least some embodiments of the invention can be administered with a needles hypodermic injection device, such as the devices disclosed in U.S. Pat. Nos. 5,399,163; 5,383,851; 5,312,335; 5,064,413; 4,941,880; 4,790,824; or 4,596,556. Examples of well-known implants and modules useful in the present invention include: U.S. Pat. No. 4,487,603, which discloses an implantable micro-infusion pump for dispensing medication at a controlled rate; U.S. Pat. No. 4,486,194, which discloses a therapeutic device for administering medicaments through the skin; U.S. Pat. No. 4,447,233, which discloses a medication infusion pump for delivering medication at a precise infusion rate; U.S. Pat. No. 4,447,224, which discloses a variable flow implantable infusion apparatus for continuous drug delivery; U.S. Pat. No. 4,439,196, which discloses an osmotic drug delivery system having multi-chamber compartments; and U.S. Pat. No. 4,475,196, which discloses an osmotic drug delivery system. These patents are incorporated herein by reference. Many other such implants, delivery systems, and modules are known to those skilled in the art.

In certain embodiments, the antibodies, LY6G6F, VSIG10, TMEM25 and/or LSR soluble proteins, ectodomains, and/or fusion proteins, can be formulated to ensure proper distribution in vivo. For example, the blood-brain barrier (BBB) excludes many highly hydrophilic compounds. To ensure that the therapeutic compounds according to at least some embodiments of the invention cross the BBB (if desired), they can be formulated, for example, in liposomes. For methods of manufacturing liposomes, see, e.g., U.S. Pat. Nos. 4,522,811; 5,374,548; and 5,399,331. The liposomes may comprise one or more moieties which are selectively transported into specific cells or organs, thus enhance targeted drug delivery (see, e.g., V. V. Ranade (1989) J. Clin. Pharmacol. 29:685). Exemplary targeting moieties include folate or biotin (see, e.g., U.S. Pat. No. 5,416,016 to Low et al.); mannosides (Umezawa et al., (1988) Biochem. Biophys. Res. Commun. 153:1038); antibodies (P. G. Bloeman et al. (1995) FEBS Lett. 357:140; M. Owais et al. (1995) Antimicrob. Agents Chemother. 39:180); surfactant protein A receptor (Briscoe et al. (1995) Am. J Physiol. 1233:134); p120 (Schreier et al. (1994) J. Biol. Chem. 269:9090); see also K. Keinanen; M. L. Laukkanen (1994) FEBS Lett. 346:123; J. J. Killion; I. J. Fidler (1994) Immunomethods 4:273.

The anti-LY6G6F, anti-VSIG10, anti-TMEM25 and anti-LSR antibodies, according to at least some embodiments of the present invention, can be used as neutralizing antibodies. A Neutralizing antibody (Nabs), is an antibody that is capable of binding and neutralizing or inhibiting a specific antigen thereby inhibiting its biological effect, for example by blocking the receptors on the cell or the virus, inhibiting the binding of the virus to the host cell. NAbs will partially or completely abrogate the biological action of an agent by either blocking an important surface molecule needed for its activity or by interfering with the binding of the agent to its receptor on a target cell.

In yet another embodiment, immunoconjugates of the invention can be used to target compounds (e.g., therapeutic agents, labels, cytotoxins, radiotoxins immunosuppressants, etc.) to cells which have LY6G6F, VSIG10, TMEM25 and/or LSR cell surface receptors by linking such compounds to the antibody. Thus, the invention also provides methods for localizing ex vivo or in vivo cells expressing LY6G6F, VSIG10, TMEM25 and/or LSR (e.g., with a detectable label, such as a radioisotope, a fluorescent compound, an enzyme, or an enzyme co-factor). Alternatively, the immunoconjugates can be used to kill cells which have LY6G6F, VSIG10, TMEM25 and/or LSR cell surface receptors by targeting cytotoxins or radiotoxins to LY6G6F, VSIG10, TMEM25 and/or LSR antigen.

Diagnostic Uses of LY6G6F, VSIG10, TMEM25 and/or LSR Polypeptides and Corresponding Polynucleotides

According to some embodiments, the sample taken from a subject (patient) to perform the diagnostic assay according to at least some embodiments of the present invention is selected from the group consisting of a body fluid or secretion including but not limited to blood, serum, urine, plasma, prostatic fluid, seminal fluid, semen, the external secretions of the skin, respiratory, intestinal, and genitourinary tracts, tears, cerebrospinal fluid, synovial fluid, sputum, saliva, milk, peritoneal fluid, pleural fluid, cyst fluid, secretions of the breast ductal system (and/or lavage thereof), broncho alveolar lavage, lavage of the reproductive system and lavage of any other part of the body or system in the body; samples of any organ including isolated cells or tissues, wherein the cell or tissue can be obtained from an organ selected from, but not limited to lung, colon, ovarian and/or breast tissue; stool or a tissue sample, or any combination thereof. In some embodiments, the term encompasses samples of in vivo cell culture constituents. Prior to be subjected to the diagnostic assay, the sample can optionally be diluted with a suitable eluant.

In some embodiments, the phrase “marker” in the context of the present invention refers to a nucleic acid fragment, a peptide, or a polypeptide, which is differentially present in a sample taken from patients (subjects) having one of the herein-described diseases or conditions, as compared to a comparable sample taken from subjects who do not have one the above-described diseases or conditions.

In some embodiments, the phrase “differentially present” refers to differences in the quantity or quality of a marker present in a sample taken from patients having one of the herein-described diseases or conditions as compared to a comparable sample taken from patients who do not have one of the herein-described diseases or conditions. For example, a nucleic acid fragment may optionally be differentially present between the two samples if the amount of the nucleic acid fragment in one sample is significantly different from the amount of the nucleic acid fragment in the other sample, for example as measured by hybridization and/or NAT-based assays. A polypeptide is differentially present between the two samples if the amount of the polypeptide in one sample is significantly different from the amount of the polypeptide in the other sample. It should be noted that if the marker is detectable in one sample and not detectable in the other, then such a marker can be considered to be differentially present. Optionally, a relatively low amount of up-regulation may serve as the marker, as described herein. One of ordinary skill in the art could easily determine such relative levels of the markers; further guidance is provided in the description of each individual marker below.

In some embodiments, the phrase “diagnostic” means identifying the presence or nature of a pathologic condition. Diagnostic methods differ in their sensitivity and specificity. The “sensitivity” of a diagnostic assay is the percentage of diseased individuals who test positive (percent of “true positives”). Diseased individuals not detected by the assay are “false negatives.” Subjects who are not diseased and who test negative in the assay are termed “true negatives.” The “specificity” of a diagnostic assay is 1 minus the false positive rate, where the “false positive” rate is defined as the proportion of those without the disease who test positive. While a particular diagnostic method may not provide a definitive diagnosis of a condition, it suffices if the method provides a positive indication that aids in diagnosis.

As used herein the term “diagnosis” refers to the process of identifying a medical condition or disease by its signs, symptoms, and in particular from the results of various diagnostic procedures, including e.g. detecting the expression of the nucleic acids or polypeptides according to at least some embodiments of the invention in a biological sample (e.g. in cells, tissue or serum, as defined below) obtained from an individual. Furthermore, as used herein the term “diagnosis” encompasses screening for a disease, detecting a presence or a severity of a disease, providing prognosis of a disease, monitoring disease progression or relapse, as well as assessment of treatment efficacy and/or relapse of a disease, disorder or condition, as well as selecting a therapy and/or a treatment for a disease, optimization of a given therapy for a disease, monitoring the treatment of a disease, and/or predicting the suitability of a therapy for specific patients or subpopulations or determining the appropriate dosing of a therapeutic product in patients or subpopulations. The diagnostic procedure can be performed in vivo or in vitro.

In some embodiments, the phrase “qualitative” when in reference to differences in expression levels of a polynucleotide or polypeptide as described herein, refers to the presence versus absence of expression, or in some embodiments, the temporal regulation of expression, or in some embodiments, the timing of expression, or in some embodiments, any post-translational modifications to the expressed molecule, and others, as will be appreciated by one skilled in the art. In some embodiments, the phrase “quantitative” when in reference to differences in expression levels of a polynucleotide or polypeptide as described herein, refers to absolute differences in quantity of expression, as determined by any means, known in the art, or in other embodiments, relative differences, which may be statistically significant, or in some embodiments, when viewed as a whole or over a prolonged period of time, etc., indicate a trend in terms of differences in expression.

In some embodiments, the term “diagnosing” refers to classifying a disease or a symptom, determining a severity of the disease, monitoring disease progression, forecasting an outcome of a disease and/or prospects of recovery. The term “detecting” may also optionally encompass any of the above.

Diagnosis of a disease according to the present invention can, in some embodiments, be affected by determining a level of a polynucleotide or a polypeptide of the present invention in a biological sample obtained from the subject, wherein the level determined can be correlated with predisposition to, or presence or absence of the disease. It should be noted that a “biological sample obtained from the subject” may also optionally comprise a sample that has not been physically removed from the subject, as described in greater detail below.

In some embodiments, the term “level” refers to expression levels of RNA and/or protein or to DNA copy number of a marker of the present invention.

Typically the level of the marker in a biological sample obtained from the subject is different (i.e., increased or decreased) from the level of the same marker in a similar sample obtained from a healthy individual (examples of biological samples are described herein).

Numerous well known tissue or fluid collection methods can be utilized to collect the biological sample from the subject in order to determine the level of DNA, RNA and/or polypeptide of the marker of interest in the subject.

Examples include, but are not limited to, fine needle biopsy, needle biopsy, core needle biopsy and surgical biopsy (e.g., brain biopsy), and lavage. Regardless of the procedure employed, once a biopsy/sample is obtained the level of the marker can be determined and a diagnosis can thus be made.

Determining the level of the same marker in normal tissues of the same origin is preferably effected along-side to detect an elevated expression and/or amplification and/or a decreased expression, of the marker as opposed to the normal tissues.

In some embodiments, the term “test amount” of a marker refers to an amount of a marker in a subject's sample that is consistent with a diagnosis of a particular disease or condition. A test amount can be either in absolute amount (e.g., microgram/nil) or a relative amount (e.g., relative intensity of signals).

In some embodiments, the term “control amount” of a marker can be any amount or a range of amounts to be compared against a test amount of a marker. For example, a control amount of a marker can be the amount of a marker in a patient with a particular disease or condition or a person without such a disease or condition. A control amount can be either in absolute amount (e.g., microgram/nil) or a relative amount (e.g., relative intensity of signals).

In some embodiments, the term “detect” refers to identifying the presence, absence or amount of the object to be detected.

In some embodiments, the term “label” includes any moiety or item detectable by spectroscopic, photo chemical, biochemical, immunochemical, or chemical means. For example, useful labels include 32P, 35S, fluorescent dyes, electron-dense reagents, enzymes (e.g., as commonly used in an ELISA), biotin-streptavadin, dioxigenin, haptens and proteins for which antisera or monoclonal antibodies are available, or nucleic acid molecules with a sequence complementary to a target. The label often generates a measurable signal, such as a radioactive, chromogenic, or fluorescent signal, that can be used to quantify the amount of bound label in a sample. The label can be incorporated in or attached to a primer or probe either covalently, or through ionic, van der Waals or hydrogen bonds, e.g., incorporation of radioactive nucleotides, or biotinylated nucleotides that are recognized by streptavadin. The label may be directly or indirectly detectable. Indirect detection can involve the binding of a second label to the first label, directly or indirectly. For example, the label can be the ligand of a binding partner, such as biotin, which is a binding partner for streptavadin, or a nucleotide sequence, which is the binding partner for a complementary sequence, to which it can specifically hybridize. The binding partner may itself be directly detectable, for example, an antibody may be itself labeled with a fluorescent molecule. The binding partner also may be indirectly detectable, for example, a nucleic acid having a complementary nucleotide sequence can be a part of a branched DNA molecule that is in turn detectable through hybridization with other labeled nucleic acid molecules (see, e.g., P. D. Fahrlander and A. Klausner, Bio/Technology 6:1165 (1988)). Quantitation of the signal is achieved by, e.g., scintillation counting, densitometry, or flow cytometry.

Exemplary detectable labels, optionally and preferably for use with immunoassays, include but are not limited to magnetic beads, fluorescent dyes, radiolabels, enzymes (e.g., horse radish peroxide, alkaline phosphatase and others commonly used in an ELISA), and calorimetric labels such as colloidal gold or colored glass or plastic beads. Alternatively, the marker in the sample can be detected using an indirect assay, wherein, for example, a second, labeled antibody is used to detect bound marker-specific antibody, and/or in a competition or inhibition assay wherein, for example, a monoclonal antibody which binds to a distinct epitope of the marker are incubated simultaneously with the mixture.

“Immunoassay” is an assay that uses an antibody to specifically bind an antigen. The immunoassay is characterized by the use of specific binding properties of a particular antibody to isolate, target, and/or quantify the antigen.

The phrase “specifically (or selectively) binds” to an antibody or “specifically (or selectively) immunoreactive with,” or “specifically interacts or binds” when referring to a protein or peptide (or other epitope), refers, in some embodiments, to a binding reaction that is determinative of the presence of the protein in a heterogeneous population of proteins and other biologics. Thus, under designated immunoassay conditions, the specified antibodies bind to a particular protein at least two times greater than the background (non-specific signal) and do not substantially bind in a significant amount to other proteins present in the sample. Specific binding to an antibody under such conditions may require an antibody that is selected for its specificity for a particular protein. For example, polyclonal antibodies raised to seminal basic protein from specific species such as rat, mouse, or human can be selected to obtain only those polyclonal antibodies that are specifically immunoreactive with seminal basic protein and not with other proteins, except for polymorphic variants and alleles of seminal basic protein. This selection may be achieved by subtracting out antibodies that cross-react with seminal basic protein molecules from other species. A variety of immunoassay formats may be used to select antibodies specifically immunoreactive with a particular protein. For example, solid-phase ELISA immunoassays are routinely used to select antibodies specifically immunoreactive with a protein (see, e.g., Harlow & Lane, Antibodies, A Laboratory Manual (1988), for a description of immunoassay formats and conditions that can be used to determine specific immunoreactivity). Typically a specific or selective reaction will be at least twice background signal or noise and more typically more than 10 to 100 times background.

In another embodiment, this invention provides a method for detecting the polypeptides of this invention in a biological sample, comprising: contacting a biological sample with an antibody specifically recognizing a polypeptide according to the present invention and detecting said interaction; wherein the presence of an interaction correlates with the presence of a polypeptide in the biological sample.

In some embodiments of the present invention, the polypeptides described herein are non-limiting examples of markers for diagnosing a disease and/or an indicative condition. Each marker of the present invention can be used alone or in combination, for various uses, including but not limited to, prognosis, prediction, screening, early diagnosis, determination of progression, therapy selection and treatment monitoring of a disease and/or an indicative condition.

In a related object the detected diseases will include cancers such as non-solid and solid tumors, sarcomas and hematological malignancies.

In another related object the detected diseases will include autoimmune disorders, rejection of any organ transplant and/or Graft versus host disease.

Each polypeptide/polynucleotide of the present invention can be used alone or in combination, for various uses, including but not limited to, prognosis, prediction, screening, early diagnosis, determination of progression, therapy selection and treatment monitoring of disease and/or an indicative condition, as detailed above.

Such a combination may optionally comprise any subcombination of markers, and/or a combination featuring at least one other marker, for example a known marker. Furthermore, such a combination may optionally and preferably be used as described above with regard to determining a ratio between a quantitative or semi-quantitative measurement of any marker described herein to any other marker described herein, and/or any other known marker, and/or any other marker.

In some embodiments of the present invention, there are provided of methods, uses, devices and assays for the diagnosis of a disease or condition. Optionally a plurality of markers may be used with the present invention. The plurality of markers may optionally include a markers described herein, and/or one or more known markers. The plurality of markers is preferably then correlated with the disease or condition. For example, such correlating may optionally comprise determining the concentration of each of the plurality of markers, and individually comparing each marker concentration to a threshold level. Optionally, if the marker concentration is above or below the threshold level (depending upon the marker and/or the diagnostic test being performed), the marker concentration correlates with the disease or condition. Optionally and preferably, a plurality of marker concentrations correlates with the disease or condition.

Alternatively, such correlating may optionally comprise determining the concentration of each of the plurality of markers, calculating a single index value based on the concentration of each of the plurality of markers, and comparing the index value to a threshold level.

Also alternatively, such correlating may optionally comprise determining a temporal change in at least one of the markers, and wherein the temporal change is used in the correlating step.

Also alternatively, such correlating may optionally comprise determining whether at least “X” number of the plurality of markers has a concentration outside of a predetermined range and/or above or below a threshold (as described above). The value of “X” may optionally be one marker, a plurality of markers or all of the markers; alternatively or additionally, rather than including any marker in the count for “X”, one or more specific markers of the plurality of markers may optionally be required to correlate with the disease or condition (according to a range and/or threshold).

Also alternatively, such correlating may optionally comprise determining whether a ratio of marker concentrations for two markers is outside a range and/or above or below a threshold. Optionally, if the ratio is above or below the threshold level and/or outside a range, the ratio correlates with the disease or condition.

Optionally, a combination of two or more these correlations may be used with a single panel and/or for correlating between a plurality of panels.

Optionally, the method distinguishes a disease or condition with a sensitivity of at least 70% at a specificity of at least 85% when compared to normal subjects. As used herein, sensitivity relates to the number of positive (diseased) samples detected out of the total number of positive samples present; specificity relates to the number of true negative (non-diseased) samples detected out of the total number of negative samples present. Preferably, the method distinguishes a disease or condition with a sensitivity of at least 80% at a specificity of at least 90% when compared to normal subjects. More preferably, the method distinguishes a disease or condition with a sensitivity of at least 90% at a specificity of at least 90% when compared to normal subjects. Also more preferably, the method distinguishes a disease or condition with a sensitivity of at least 70% at a specificity of at least 85% when compared to subjects exhibiting symptoms that mimic disease or condition symptoms.

A marker panel may be analyzed in a number of fashions well known to those of skill in the art. For example, each member of a panel may be compared to a “normal” value, or a value indicating a particular outcome. A particular diagnosis/prognosis may depend upon the comparison of each marker to this value; alternatively, if only a subset of markers is outside of a normal range, this subset may be indicative of a particular diagnosis/prognosis. The skilled artisan will also understand that diagnostic markers, differential diagnostic markers, prognostic markers, time of onset markers, disease or condition differentiating markers, etc., may be combined in a single assay or device. Markers may also be commonly used for multiple purposes by, for example, applying a different threshold or a different weighting factor to the marker for the different purposes.

In one embodiment, the panels comprise markers for the following purposes: diagnosis of a disease; diagnosis of disease and indication if the disease is in an acute phase and/or if an acute attack of the disease has occurred; diagnosis of disease and indication if the disease is in a non-acute phase and/or if a non-acute attack of the disease has occurred; indication whether a combination of acute and non-acute phases or attacks has occurred; diagnosis of a disease and prognosis of a subsequent adverse outcome; diagnosis of a disease and prognosis of a subsequent acute or non-acute phase or attack; disease progression (for example for cancer, such progression may include for example occurrence or recurrence of metastasis).

The above diagnoses may also optionally include differential diagnosis of the disease to distinguish it from other diseases, including those diseases that may feature one or more similar or identical symptoms.

In certain embodiments, one or more diagnostic or prognostic indicators are correlated to a condition or disease by merely the presence or absence of the indicators. In other embodiments, threshold levels of a diagnostic or prognostic indicators can be established, and the level of the indicators in a patient sample can simply be compared to the threshold levels. The sensitivity and specificity of a diagnostic and/or prognostic test depends on more than just the analytical “quality” of the test—they also depend on the definition of what constitutes an abnormal result. In practice, Receiver Operating Characteristic curves, or “ROC” curves, are typically calculated by plotting the value of a variable versus its relative frequency in “normal” and “disease” populations, and/or by comparison of results from a subject before, during and/or after treatment.

According to at least some embodiments of the present invention, LY6G6F, VSIG10, TMEM25 and/or LSR protein, polynucleotide or a fragment thereof, may be featured as a biomarker for detecting disease and/or an indicative condition, as detailed above.

According to still other embodiments, the present invention optionally and preferably encompasses any amino acid sequence or fragment thereof encoded by a nucleic acid sequence corresponding to LY6G6F, VSIG10, TMEM25 and/or LSR as described herein. Any oligopeptide or peptide relating to such an amino acid sequence or fragment thereof may optionally also (additionally or alternatively) be used as a biomarker.

In still other embodiments, the present invention provides a method for detecting a polynucleotide of this invention in a biological sample, using NAT based assays, comprising: hybridizing the isolated nucleic acid molecules or oligonucleotide fragments of at least about a minimum length to a nucleic acid material of a biological sample and detecting a hybridization complex; wherein the presence of a hybridization complex correlates with the presence of the polynucleotide in the biological sample. Non-limiting examples of methods or assays are described below.

The present invention also relates to kits based upon such diagnostic methods or assays. Also within the scope of the present invention are kits comprising the LY6G6F, VSIG10, TMEM25 and/or LSR protein or LY6G6F, VSIG10, TMEM25 and/or LSR conjugates or antibody compositions of the invention (e.g., human antibodies, bispecific or multispecific molecules, or immunoconjugates) and instructions for use. The kit can further contain one or more additional reagents, such as an immunosuppressive reagent, a cytotoxic agent or a radiotoxic agent, or one or more additional human antibodies according to at least some embodiments of the invention (e.g., a human antibody having a complementary activity which binds to an epitope in the antigen distinct from the first human antibody).

Nucleic Acid Technology (Nat) Based Assays:

Detection of a nucleic acid of interest in a biological sample may also optionally be effected by NAT-based assays, which involve nucleic acid amplification technology, such as PCR for example (or variations thereof such as real-time PCR for example). As used herein, a “primer” defines an oligonucleotide which is capable of annealing to (hybridizing with) a target sequence, thereby creating a double stranded region which can serve as an initiation point for DNA synthesis under suitable conditions. Amplification of a selected, or target, nucleic acid sequence may be carried out by a number of suitable methods known in the art. Non-limiting examples of amplification techniques include polymerase chain reaction (PCR), ligase chain reaction (LCR), strand displacement amplification (SDA), transcription-based amplification, the q3 replicase system and NASBA (Kwoh et al., 1989, Proc. Natl. Acad. Sci. USA 86, 1173-1177; Lizardi et al., 1988, BioTechnology 6:1197-1202; Malek et al., 1994, Methods Mol. Biol., 28:253-260; and Sambrook et al., 1989, supra). Non-limiting examples of Nucleic Acid Technology-based assay is selected from the group consisting of a PCR, Real-Time PCR, LCR, Self-Sustained Synthetic Reaction, Q-Beta Replicase, Cycling probe reaction, Branched DNA, RFLP analysis, DGGE/TGGE, Single-Strand Conformation Polymorphism, Dideoxy fingerprinting, microarrays, Fluorescense In Situ Hybridization and Comparative Genomic Hybridization. The terminology “amplification pair” (or “primer pair”) refers herein to a pair of oligonucleotides (oligos) of the present invention, which are selected to be used together in amplifying a selected nucleic acid sequence by one of a number of types of amplification processes, preferably a polymerase chain reaction. As commonly known in the art, the oligos are designed to bind to a complementary sequence under selected conditions. In one particular embodiment, amplification of a nucleic acid sample from a patient is amplified under conditions which favor the amplification of the most abundant differentially expressed nucleic acid. In one preferred embodiment, RT-PCR is carried out on an mRNA sample from a patient under conditions which favor the amplification of the most abundant mRNA. In another preferred embodiment, the amplification of the differentially expressed nucleic acids is carried out simultaneously. It will be realized by a person skilled in the art that such methods could be adapted for the detection of differentially expressed proteins instead of differentially expressed nucleic acid sequences. The nucleic acid (i.e. DNA or RNA) for practicing the present invention may be obtained according to well known methods.

Oligonucleotide primers of the present invention may be of any suitable length, depending on the particular assay format and the particular needs and targeted genomes employed. Optionally, the oligonucleotide primers are at least 12 nucleotides in length, preferably between 15 and 24 molecules, and they may be adapted to be especially suited to a chosen nucleic acid amplification system. As commonly known in the art, the oligonucleotide primers can be designed by taking into consideration the melting point of hybridization thereof with its targeted sequence (Sambrook et al., 1989, Molecular Cloning—A Laboratory Manual, 2nd Edition, CSH Laboratories; Ausubel et al., 1989, in Current Protocols in Molecular Biology, John Wiley & Sons Inc., N.Y.).

Immunoassays

In another embodiment of the present invention, an immunoassay can be used to qualitatively or quantitatively detect and analyze markers in a sample. This method comprises: providing an antibody that specifically binds to a marker; contacting a sample with the antibody; and detecting the presence of a complex of the antibody bound to the marker in the sample.

To prepare an antibody that specifically binds to a marker, purified protein markers can be used. Antibodies that specifically bind to a protein marker can be prepared using any suitable methods known in the art.

After the antibody is provided, a marker can be detected and/or quantified using any of a number of well recognized immunological binding assays. Useful assays include, for example, an enzyme immune assay (EIA) such as enzyme-linked immunosorbent assay (ELISA), a radioimmune assay (RIA), a Western blot assay, or a slot blot assay see, e.g., U.S. Pat. Nos. 4,366,241; 4,376,110; 4,517,288; and 4,837,168). Generally, a sample obtained from a subject can be contacted with the antibody that specifically binds the marker.

Optionally, the antibody can be fixed to a solid support to facilitate washing and subsequent isolation of the complex, prior to contacting the antibody with a sample. Examples of solid supports include but are not limited to glass or plastic in the form of, e.g., a microtiter plate, a stick, a bead, or a microbead. Antibodies can also be attached to a solid support.

After incubating the sample with antibodies, the mixture is washed and the antibody-marker complex formed can be detected. This can be accomplished by incubating the washed mixture with a detection reagent. Alternatively, the marker in the sample can be detected using an indirect assay, wherein, for example, a second, labeled antibody is used to detect bound marker-specific antibody, and/or in a competition or inhibition assay wherein, for example, a monoclonal antibody which binds to a distinct epitope of the marker are incubated simultaneously with the mixture.

Throughout the assays, incubation and/or washing steps may be required after each combination of reagents. Incubation steps can vary from about 5 seconds to several hours, preferably from about 5 minutes to about 24 hours. However, the incubation time will depend upon the assay format, marker, volume of solution, concentrations and the like. Usually the assays will be carried out at ambient temperature, although they can be conducted over a range of temperatures, such as 10° C. to 40° C.

The immunoassay can be used to determine a test amount of a marker in a sample from a subject. First, a test amount of a marker in a sample can be detected using the immunoassay methods described above. If a marker is present in the sample, it will form an antibody-marker complex with an antibody that specifically binds the marker under suitable incubation conditions described above. The amount of an antibody-marker complex can optionally be determined by comparing to a standard. As noted above, the test amount of marker need not be measured in absolute units, as long as the unit of measurement can be compared to a control amount and/or signal.

Radio-immunoassay (RIA): In one version, this method involves precipitation of the desired substrate and in the methods detailed herein below, with a specific antibody and radiolabeled antibody binding protein (e.g., protein A labeled with 1125) immobilized on a precipitable carrier such as agarose beads. The number of counts in the precipitated pellet is proportional to the amount of substrate.

In an alternate version of the RIA, a labeled substrate and an unlabeled antibody binding protein are employed. A sample containing an unknown amount of substrate is added in varying amounts. The decrease in precipitated counts from the labeled substrate is proportional to the amount of substrate in the added sample.

Enzyme linked immunosorbent assay (ELISA): This method involves fixation of a sample (e.g., fixed cells or a proteinaceous solution) containing a protein substrate to a surface such as a well of a microtiter plate. A substrate specific antibody coupled to an enzyme is applied and allowed to bind to the substrate. Presence of the antibody is then detected and quantitated by a colorimetric reaction employing the enzyme coupled to the antibody. Enzymes commonly employed in this method include horseradish peroxidase and alkaline phosphatase. If well calibrated and within the linear range of response, the amount of substrate present in the sample is proportional to the amount of color produced. A substrate standard is generally employed to improve quantitative accuracy.

Western blot: This method involves separation of a substrate from other protein by means of an acrylamide gel followed by transfer of the substrate to a membrane (e.g., nylon or PVDF). Presence of the substrate is then detected by antibodies specific to the substrate, which are in turn detected by antibody binding reagents. Antibody binding reagents may be, for example, protein A, or other antibodies. Antibody binding reagents may be radiolabeled or enzyme linked as described hereinabove. Detection may be by autoradiography, colorimetric reaction or chemiluminescence. This method allows both quantitation of an amount of substrate and determination of its identity by a relative position on the membrane which is indicative of a migration distance in the acrylamide gel during electrophoresis.

Immunohistochemical analysis: This method involves detection of a substrate in situ in fixed cells by substrate specific antibodies. The substrate specific antibodies may be enzyme linked or linked to fluorophores. Detection is by microscopy and subjective evaluation. If enzyme linked antibodies are employed, a colorimetric reaction may be required.

Fluorescence activated cell sorting (FACS): This method involves detection of a substrate in situ in cells by substrate specific antibodies. The substrate specific antibodies are linked to fluorophores. Detection is by means of a cell sorting machine which reads the wavelength of light emitted from each cell as it passes through a light beam. This method may employ two or more antibodies simultaneously.

Radio-Imaging Methods

These methods include but are not limited to, positron emission tomography (PET) single photon emission computed tomography (SPECT). Both of these techniques are non-invasive, and can be used to detect and/or measure a wide variety of tissue events and/or functions, such as detecting cancerous cells for example. Unlike PET, SPECT can optionally be used with two labels simultaneously. SPECT has some other advantages as well, for example with regard to cost and the types of labels that can be used. For example, U.S. Pat. No. 6,696,686 describes the use of SPECT for detection of breast cancer, and is hereby incorporated by reference as if fully set forth herein.

Theranostics:

The term theranostics describes the use of diagnostic testing to diagnose the disease, choose the correct treatment regime according to the results of diagnostic testing and/or monitor the patient response to therapy according to the results of diagnostic testing. Theranostic tests can be used to select patients for treatments that are particularly likely to benefit them and unlikely to produce side-effects. They can also provide an early and objective indication of treatment efficacy in individual patients, so that (if necessary) the treatment can be altered with a minimum of delay. For example: DAKO and Genentech together created HercepTest and Herceptin (trastuzumab) for the treatment of breast cancer, the first theranostic test approved simultaneously with a new therapeutic drug. In addition to HercepTest (which is an immunohistochemical test), other theranostic tests are in development which use traditional clinical chemistry, immunoassay, cell-based technologies and nucleic acid tests. PPGx's recently launched TPMT (thiopurine S-methyltransferase) test, which is enabling doctors to identify patients at risk for potentially fatal adverse reactions to 6-mercaptopurine, an agent used in the treatment of leukemia. Also, Nova Molecular pioneered SNP genotyping of the apolipoprotein E gene to predict Alzheimer's disease patients' responses to cholinomimetic therapies and it is now widely used in clinical trials of new drugs for this indication. Thus, the field of theranostics represents the intersection of diagnostic testing information that predicts the response of a patient to a treatment with the selection of the appropriate treatment for that particular patient.

Surrogate Markers:

A surrogate marker is a marker, that is detectable in a laboratory and/or according to a physical sign or symptom on the patient, and that is used in therapeutic trials as a substitute for a clinically meaningful endpoint. The surrogate marker is a direct measure of how a patient feels, functions, or survives which is expected to predict the effect of the therapy. The need for surrogate markers mainly arises when such markers can be measured earlier, more conveniently, or more frequently than the endpoints of interest in terms of the effect of a treatment on a patient, which are referred to as the clinical endpoints. Ideally, a surrogate marker should be biologically plausible, predictive of disease progression and measurable by standardized assays (including but not limited to traditional clinical chemistry, immunoassay, cell-based technologies, nucleic acid tests and imaging modalities).

The therapeutic compositions (e.g., human antibodies, multispecific and bispecific molecules and immunoconjugates) according to at least some embodiments of the invention which have complement binding sites, such as portions from IgG1, -2, or -3 or IgM which bind complement, can also be used in the presence of complement. In one embodiment, ex vivo treatment of a population of cells comprising target cells with a binding agent according to at least some embodiments of the invention and appropriate effector cells can be supplemented by the addition of complement or serum containing complement. Phagocytosis of target cells coated with a binding agent according to at least some embodiments of the invention can be improved by binding of complement proteins. In another embodiment target cells coated with the compositions (e.g., human antibodies, multispecific and bispecific molecules) according to at least some embodiments of the invention can also be lysed by complement. In yet another embodiment, the compositions according to at least some embodiments of the invention do not activate complement.

The therapeutic compositions (e.g., human antibodies, multispecific and bispecific molecules and immunoconjugates) according to at least some embodiments of the invention can also be administered together with complement. Thus, according to at least some embodiments of the invention there are compositions, comprising human antibodies, multispecific or bispecific molecules and serum or complement. These compositions are advantageous in that the complement is located in close proximity to the human antibodies, multispecific or bispecific molecules. Alternatively, the human antibodies, multispecific or bispecific molecules according to at least some embodiments of the invention and the complement or serum can be administered separately.

The present invention is further illustrated by the following examples. This information and examples is illustrative and should not be construed as further limiting. The contents of all figures and all references, patents and published patent applications cited throughout this application are expressly incorporated herein by reference.

EXAMPLES Example 1

Expression Pattern of the Proteins According to at Least Some Embodiments of the Invention Using MED Discovery Engine:

MED is a proprietary software platform for collection of public gene-expression data, normalization, annotation and performance of various queries. Expression data from the most widely used Affymetrix microarrays is downloaded from the Gene Expression Omnibus (GEO). Data is multiplicatively normalized by setting the 95 percentile to a constant value (normalized expression=1200), and noise is filtered by setting the lower 30% to 0. Experiments are annotated, first automatically, and then manually, to identify tissue and condition, and chips are grouped according to this annotation, and cross verification of this grouping by comparing the overall expression pattern of the genes of each chip to the overall average expression pattern of the genes in this group. Each probeset in each group is assigned an expression value which is the median of the expressions of that probeset in all chips included in the group. The vector of expression of all probesets within a certain group forms the virtual chip of that group, and the collection of all such virtual chips is a virtual panel. The panel (or sub-panels) can be queried to identify probesets with a required behavior (e.g. specific expression in a sub-set of tissues, or differential expression between disease and healthy tissues). These probesets are linked to LEADS contigs and to RefSeqs by probe-level mapping, for further analysis.

The Affymetrix platforms that are downloaded are HG-U95A and the HG-U133 family (A,B, A2.0 and PLUS 2.0). Three virtual panels were created: U95 and U133 Plus 2.0, based on the corresponding Affymetrix platforms, and U133 which uses the set of common probesets for HG-U133A, HG-U133A2.0 and HG-U133 PLUS 2.0+.

The results of the MED discovery engine are presented in scatter plots. The scatter plot is a compact representation of a given panel (collection of groups). The y-axis is the (normalized) expression and the x-axis describes the groups in the panel. For each group, the median expression is represented by a solid marker, and the expression values of the different chips in the group are represented by small dashes (“-”). The groups are ordered and marked as follows—“Other” groups (e.g. benign, non-cancer diseases, etc.) with a triangle, Treated cells with a square, Normal with a circle, Matched with a cross, and Cancer with a diamond. The number of chips in each group is also written adjacent to its name.

The MED discovery engine was used to assess the expression of VSIG10 transcripts. Expression data for Affymetrix probe sets 220137_at representing the VSIG10 gene data is shown in FIG. 3 (for all figures related to the MED discovery engine, a division was made into “A”, B”, etc for reasons of space only, so as to be able to show all probe results). As evident from the scatter plot, presented in FIG. 3, the expression of VSIG10 transcripts detectable with the above probe sets was observed in several groups of cells from the immune system, mainly in leukocytes. In various cancer conditions, differential expression was observed, for example on CD10+ leukocytes from ALL (Acute Lymphoblastic Leukemia) and BM-CD34+ cells from AML (Acute Myeloid Leukemia) cells.

FIG. 3 shows a scatter plot, demonstrating the expression of VSIG10 transcripts that encode the VSIG10 proteins, on a virtual panel of all tissues and conditions using MED discovery engine.

MED discovery engine was used to assess the expression of LSR transcripts. Expression data for Affymetrix probe sets 208190_s_at representing the LSR gene data is shown in FIG. 4. As evident from the scatter plot, presented in FIG. 4, the expression of LSR transcripts detectable with the above probe sets was observed in several groups of cells from the immune system, mainly in bone marrow cells. High expression of LSR transcripts was also observed in various cancerous conditions of tissues, such as in breast, lung, ovary, pancreas, prostate and skin cancers.

FIG. 4 shows a scatter plot, demonstrating the expression of LSR transcripts that encode the LSR proteins, on a virtual panel of all tissues and conditions using MED discovery engine.

Example 2

Methods Used to Analyze the Expression of the RNA Encoding LY6G6F, VSIG10, TMEM25 and/or LSR Proteins

The targets according to at least some embodiments of the present invention were tested with regard to their expression in various cancerous and non-cancerous tissue samples. A description of the samples used in the Ovary cancer testing panel is provided in Table 1 below. A description of the samples used in the Breast cancer testing panel is provided in Table 2 below. A description of the samples used in the Lung cancer testing panel is provided in Table 3. A description of the samples used in the Healthy testing panel is provided in Table 4. A description of the samples used in the Kidney cancer testing panel is provided in Table 5. A description of the samples used in the Liver cancer testing panel is provided in Table 6. Tests were then performed as described in the Materials and Methods section below.

Materials and Methods

RNA Preparation—

RNA was obtained from ABS (Wilmington, Del. 19801, USA, BioChain Inst. Inc. (Hayward, Calif. 94545 USA), GOG for ovary samples—Pediatic Cooperative Human Tissue Network, Gynecologic Oncology Group Tissue Bank, Children Hospital of Columbus (Columbus Ohio 43205 USA), Ambion (Austin, Tex. 78744 USA, Analytical Biological Services Inc. (Wilmington, Del. 19801 USA, Asternad (Detroit, Mich. 48202-3420, USA), Genomics Collaborative Inc. a Division of Seracare (Cambridge, Mass. 02139, USA), The Tel Aviv Sourasky Medical Center Ichilov Hospital (Tel-Aviv, ISRAEL) and from The Chaim Sheba Medical Center (Tel-Hashomer, ISRAEL, eng.sheba.co.il). RNA samples were obtained from patients or from postmortem. All total RNA samples were treated with DNaseI (Ambion).

RT-PCR for Ovary, Kidney and Healthy Panel—

10 ug of Purified RNA was mixed with Random Hexamer primers (Applied Biosystems, according to manufactures instructions), 4 mM dNTPs, 12.5 μl of 10× MultiScribe™ buffer (Applied Biosystems), 6 μl (50U/μL) RNasin (Promega) and 6 μl (50U/μL) of MultiScribe (Applied Biosystems) in a total volume of 125 The reaction was incubated for 10 min at 25° C., followed by further incubation at 37° C. for 2 hours. Then, the mixture was inactivated at 85° C. for 5 sec. The resulting cDNA was diluted 1:10-1:40 (depend on the panel calibration) in TE buffer (10 mM Tris pH=8, 1 mM EDTA pH=8).

Real-Time RT-PCR analysis was carried out as described below-cDNA (5 μl), prepared as described above, was used as a template for Real-Time PCR reactions (final volume of 20 μl) using the SYBR Green I assay (PE Applied Biosystem) with specific primers and UNG Enzyme (Eurogentech or ABI or Roche). The amplification was effected as follows: 50° C. for 2 min, 95° C. for 10 min, and then 40 cycles of 95° C. for 15 sec, followed by 60° C. for 30 sec, following by dissociation step. Detection was performed using the PE Applied Biosystem SDS 7000. The cycle in which the reactions achieved a threshold level of fluorescence (Ct=Threshold Cycle, described in detail below) was registered and was used to calculate the relative transcript quantity in the RT reactions. The relative quantity was calculated using the equation Q=efficiency{circumflex over ( )}−Ct. The efficiency of the PCR reaction was calculated from a standard curve, created by using different dilutions of several reverse transcription (RT) reactions. To minimize inherent differences in the RT reaction, the resulting relative quantities were normalized using a normalization factor calculated in the following way:

The expression of several housekeeping (HSKP) genes was checked in every panel. The relative quantity (Q) of each housekeeping gene in each sample, calculated as described above, was divided by the median quantity of this gene in all panel samples to obtain the “Relative Q rel to MED”. Then, for each sample the median of the “relative Q rel to MED” of the selected housekeeping genes was calculated and served as normalization factor of this sample for further calculations.

For each RT sample, the expression of the specific amplicon was normalized to the normalization factor calculated from the expression of different housekeeping genes. Housekeeping genes (HSKG) used for Ovary, Kidney, Lung, Liver, Breast and Healthy panels are listed in Table 7.

The HSKGs that were used for Ovary and Healthy panels calibration are: HPRT1, SDHA and G6PD; The HSKP genes used for Kidney and Liver panel calibration are: G6PD, PBGD and SDHA; The HSKP genes used for Lung panel calibration are: UBC, PBGD, HPRT and SDHA; The HSKP genes used for Breast panel calibration are: G6PD, PBGD, RPL19 and SDHA;

TABLE 1 Ovary RNA details: sample name Source sample_id DIAGNOSIS CANCER_STAGE 1-As-SI-SER Asterand 23074 SEROUS STAGE I ADENOCARCINOMA 2-As-SI-SER Asterand 22653 SEROUS STAGE I ADENOCARCINOMA 3-As-SIB-SER Asterand 18700 SEROUS STAGE IB ADENOCARCINOMA 4-As-SIB-SER Asterand 17646 SEROUS STAGE IB ADENOCARCINOMA 5-As-SIC-SER Asterand 15644 SEROUS STAGE IC ADENOCARCINOMA 6-GC-SIIB-SER GCI-1st_del 7B3DP SEROUS STAGE IIB ADENOCARCINOMA 7-As-SIIIC-SER Asterand 13268 SEROUS STAGE IIIC ADENOCARCINOMA 8-GC-SIIIC-SER GCI-1st_del 3NTIS SEROUS STAGE IIIC ADENOCARCINOMA 9-GC-SIIIC-SER GCI-1st_del CEJUS SEROUS STAGE IIIC ADENOCARCINOMA 10-GC-SIIIC-SER GCI-1st_del 1HI5H SEROUS STAGE IIIC ADENOCARCINOMA 11-GC-SIIIC-SER GCI-1st_del 7RMHZ SEROUS STAGE IIIC ADENOCARCINOMA 12-GC-SIIIC-SER GCI-1st_del 4WAAB SEROUS STAGE IIIC ADENOCARCINOMA 13-GC-SIIIC-SER GCI-1st_del 79Z67 SEROUS STAGE IIIC ADENOCARCINOMA 14-GC-SIIIC-SER GCI-1st_del DDSNL SEROUS STAGE IIIC ADENOCARCINOMA 15-GC-SIV-SER GCI-1st_del DH8PH SEROUS STAGE IV ADENOCARCINOMA 16-GC-SIA-ENDO GCI-1st_del E2WKF ENDOMETROID STAGE IA ADENOCARCINOMA 17-GC-SIA-ENDO GCI-1st_del HZ2EY ENDOMETROID STAGE IA ADENOCARCINOMA 18-GC-SIA-ENDO GCI-1st_del RWOIV ENDOMETROID STAGE IA ADENOCARCINOMA 19-GC-SIIA-ENDO GCI-1st_del 1U52X ENDOMETROID STAGE IIA ADENOCARCINOMA 20-GC-SIIB-ENDO GCI-1st_del A17WS ENDOMETROID STAGE IIB ADENOCARCINOMA 21-GC-SIIIC-ENDO GCI-1st_del 1VT3I ENDOMETROID STAGE IIIC ADENOCARCINOMA 22-GC-SIIIC-ENDO GCI-1st_del PZQXH ENDOMETROID STAGE IIIC ADENOCARCINOMA 23-GC-SIV-ENDO GCI-1st_del I8VHZ ENDOMETROID STAGE IV ADENOCARCINOMA 24-GC-SIC-MUC GCI-1st_del IMDA1 MUCINOUS STAGE IC ADENOCARCINOMA 25-As-SIC-MUC Asterand 12742 MUCINOUS STAGE IC ADENOCARCINOMA 26-AB-SIC-MUC ABS A0139 Mucinous Stage IC cystadenocarcinoma 27-AB-SIIIA-MUC ABS USA-00273 Papillary mucinous STAGE IIIA cystadenocarcinoma 28-GC-SIIIA-MUC GCI-2nd_del RAFCW MUCINOUS STAGE IIIA ADENOCARCINOMA 29-As-SIIIC-MUC Asterand 23177 MUCINOUS STAGE IIIC ADENOCARCINOMA 30-As-SIIIC-MUC Asterand 16103 MUCINOUS STAGE IIIC ADENOCARCINOMA 31-GC-SIA-BRD GCI-3rd_del SC656 MUCINOUS STAGE IA BORDERLINE TUMOR 32-GC-SIA-BRD GCI-3rd_del 3D5FO MUCINOUS STAGE IA BORDERLINE TUMOR 33-GC-SIA-BRD GCI-3rd_del 7JP3F MUCINOUS STAGE IA BORDERLINE TUMOR 34-GC-Muc-BNG GCI-1st_del QLIKY BENIGN MUCINOUS CYSTADENOMA 35-As-Muc-BNG Asterand 16870 BENIGN MUCINOUS CYSTADENOMA 36-GC-Muc-BNG GCI-1st_del 943EC BENIGN MUCINOUS CYSTADENOMA 37-GC-Muc-BNG GCI-2nd_del JO8W7 BENIGN MUCINOUS CYSTADENOMA 38-As-Ser-BNG Asterand 17016 BENIGN SEROUS IA CYSTADENOMA 39-GO-Ser-BNG GOG 99-06-G039 BENIGN SEROUS CYSTADENOMA 40-GC-Ser-BNG GCI-2nd_del DQQ2F BENIGN SEROUS CYSTADENOFIBROMA 41-As-BM-N Asterand 15690 NORMAL OVARY-BM 42-As-BM-N Asterand 16850 NORMAL OVARY-BM 43-As-BM-N Asterand 16848 NORMAL OVARY-BM 44-GC-PS-N GCI-4th_del WPU1U NORMAL OVARY-PS 45-GC-PS-N GCI-4th_del Y9VHI NORMAL OVARY-PS 46-GC-PS-N GCI-4th_del 76VM9 NORMAL OVARY-PS 47-GC-PS-N GCI-1st_del DWHTZ NORMAL OVARY-PS 48-GC-PS-N GCI-1st_del SJ2R2 NORMAL OVARY-PS 49-GC-PS-N GCI-4th_del 9RQMN NORMAL OVARY-PS 50-GC-PS-N GCI-1st_del TOAE5 NORMAL OVARY-PS 51-GC-PS-N GCI-1st_del TW9PM NORMAL OVARY-PS 52-GC-PS-N GCI-4th_del 2VND2 NORMAL OVARY-PS 53-GC-PS-N GCI-1st_del L629F NORMAL OVARY-PS 54-GC-PS-N GCI-1st_del XLB23 NORMAL OVARY-PS 55-GC-PS-N GCI-1st_del IDUVY NORMAL OVARY-PS 56-GC-PS-N GCI-4th_del ZCXAD NORMAL OVARY-PS 57-GC-PS-N GCI-4th_del PEQ6C NORMAL OVARY-PS 58-GC-PS-N GCI-1st_del DD73B NORMAL OVARY-PS 59-GC-PS-N GCI-4th_del E2UF7 NORMAL OVARY-PS 60-GC-PS-N GCI-4th_del 4YG5P NORMAL OVARY-PS 61-GC-PS-N GCI-1st_del FDPL9 NORMAL OVARY-PS 62-Bc-PM-N BioChain A503274 NORMAL OVARY-PM 63-Bc-PM-N BioChain A504086 NORMAL OVARY-PM 64-Ic-PM-N Ichilov CG-188-7 NORMAL OVARY-PM 65-GO-SIIIC-SER GOG 2001-12-G035 Serous adenocarcinoma Stage 3C 66-AB-SIIIC-SER ABS N0021 Papillary serous Stage 3C adenocarcinoma 67-BC-SER BioChain A503175 Serous papillary cystadenocarcinoma 68-Bc-SER Biochain A406023 Adenocarcinoma 69-Bc-SER Biochain A407068 Adenocarcinoma 70-AB-SER ABS ILS-7286 Papillary UN cystadenocarcinoma 71-AB-SER ABS A0106 adenocarcinoma UN 72-AB-SER ABS ILS-1431 Papillary adenocarcinoma UN 73-Bc-SER BioChain A503176 Serous papillary cystadenocarcinoma 74-AB-SER ABS ILS-1408 Papillary adenocarcinoma UN 75-Bc-SER Biochain A407069 Adenocarcinoma 76-AB-SER ABS ILS-1406 Papillary adenocarcinoma UN 77-GO-Ser Mix SIIIC-OTR GOG 2002-05-G509 Mixed serous and Stage 3C endometrioid adenocarcinoma of mullerian 78-Bc-MUC BioChain A504083 Mucinous adenocarcinoma 79-Bc-MUC BioChain A504084 Mucinous adenocarcinoma 80-Bc-Car-OTR BioChain A407065 Carcinoma 81-GO-Clear cell SIIIA- GOG 2001-10-G002 Clear cell Stage 3A OTR adenocarcinoma 82-AB-BRD ABS VNM-00187 Mucinous cystadenocarcinoma with low malignant 83-GO-SIA-BRD GOG 98-08-G001 Endometroid Stage lA adenocarcinoma of borderline malignancy

TABLE 2 Breast RNA details: sample name Source sample_id Sample DIAGNOSIS CANCER_STAGE 1-As-DCIS S0 Asterand 19723 Ductal Carcinoma STAGE 0 In Situ(DCIS) 2-GC-IDC SI GCI- 5IRTK INFILTRATING STAGE I 1st_del DUCTAL CARCINOMA 3-(42)-AB-IDC SI ABS 6005020031T INFILTRATING STAGE I DUCTAL CARCINOMA 4-(7)-AB-IDC SI ABS 7263T INFILTRATING STAGE I DUCTAL CARCINOMA 5-GC-IDC SI GCI- D5152 INFILTRATING STAGE I 1st_del DUCTAL CARCINOMA 6-GC-IDC SI GCI- S2GBY INFILTRATING STAGE I 1st_del DUCTAL CARCINOMA 7-GC-IDC SI GCI- POPHP INFILTRATING STAGE I 1st_del DUCTAL CARCINOMA 8-GC-IDC SI GCI- I2YLE INFILTRATING STAGE I 1st_del DUCTAL CARCINOMA 9-As-IDC SI Asterand 17959 INFILTRATING STAGE I DUCTAL CARCINOMA 10-(12)-AB-IDC SIIA ABS 1432T INFILTRATING STAGE IIA DUCTAL CARCINOMA 11-As-IDC SIIA Asterand 17138 INFILTRATING STAGE IIA DUCTAL CARCINOMA 12-GC-IDC SIIA GCI- YSZ67 INFILTRATING STAGE IIA 1st_del DUCTAL CARCINOMA 13-(6)-AB-IDC SIIA ABS 7238T INFILTRATING STAGE IIA DUCTAL CARCINOMA 14-(26)-AB-IDC SIIA ABS 7249T INFILTRATING STAGE IIA DUCTAL CARCINOMA 15-GC-IDC SIIA GCI- UT3SE INFILTRATING STAGE IIA 1st_del DUCTAL CARCINOMA 16-GC-IDC SIIA GCI- PVSYX INFILTRATING STAGE IIA 1st_del DUCTAL CARCINOMA 17-GC-IDC SIIA GCI- GETCV INFILTRATING STAGE IIA 1st_del DUCTAL CARCINOMA 18-(27)-AB-IDC SIIA ABS 4907020072T INFILTRATING STAGE IIA DUCTAL CARCINOMA 19-GC-IDC SIIB GCI- SE5BK INFILTRATING STAGE IIB 1st_del DUCTAL CARCINOMA 20-GC-IDC SIIB GCI- OLKL4 INFILTRATING STAGE IIB 1st_del DUCTAL CARCINOMA 21-GC-IDC SIIB GCI- VK1EJ INFILTRATING STAGE IIB 1st_del DUCTAL CARCINOMA 22-GC-IDC SIIB GCI- 3Z5Z4 INFILTRATING STAGE IIB 1st_del DUCTAL CARCINOMA 23-(13)-AB-IDC SIIB ABS A0133T INFILTRATING STAGE IIB DUCTAL CARCINOMA 24-GC-IDC SIIB GCI- J5MPN INFILTRATING STAGE IIB 1st_del DUCTAL CARCINOMA 25-GC-IDC SIIB GCI- 54NTA INFILTRATING STAGE IIB 1st_del DUCTAL CARCINOMA 27-GC-IDC SIIIA GCI- RD3F9 INFILTRATING STAGE IIIA 1st_del DUCTAL CARCINOMA 28-(17)-AB-IDC ABS 4904020036T INFILTRATING STAGE IIIA SIIIA DUCTAL CARCINOMA 29-(16)-AB-IDC IIIA ABS 4904020032T INFILTRATING STAGE IIIA DUCTAL CARCINOMA 30-(15)-AB-IDC ABS 7259T INFILTRATING STAGE IIIA SIIIA DUCTAL CARCINOMA 31-GC-IDC SIIIA GCI- YOLOF INFILTRATING STAGE IIIA 1st_del DUCTAL CARCINOMA 32-GC-IDC SIIIB GCI- 4W2NY INFILTRATING STAGE IIIB 1st_del DUCTAL CARCINOMA 33-GC-IDC SIIIB GCI- YQ1WW INFILTRATING STAGE IIIB 1st_del DUCTAL CARCINOMA 34-GC-IDC SIIIB GCI- KIOE7 INFILTRATING STAGE IIIB 1st_del DUCTAL CARCINOMA 35-As-ILC SI Asterand 17090 INFILTRATING STAGE I LOBULAR CARCINOMA 36-GC-ILC SIIA GCI- I35US INFILTRATING STAGE IIA 1st_del LOBULAR CARCINOMA 37-GC-ILC SIIB GCI- IS84Y INFILTRATING STAGE IIB 1st_del LOBULAR CARCINOMA 38-(52)-Bc-ILC Biochain A605360 INFILTRATING LOBULAR CARCINOMA 39-As-BNG Asterand 11975 FIBROADENOMA 40-GC-BNG GCI- ZT15M FIBROADENOMA 2nd_del 41-GC-BNG GCI- NNP3Q FIBROADENOMA 2nd_del 42-GC-BNG GCI- QK8IY FIBROADENOMA 2nd_del 43-GC-NPS GCI- 83LO7 NORMAL 1st_del BREAST-PS 45-GC-N PS GCI- O6JBJ NORMAL 2nd_del BREAST-PS 46-GC-N PS GCI- E6UDD NORMAL 2nd_del BREAST-PS 47-GC-N PS GCI- DHLR1 NORMAL 1st_del BREAST-PS 48-GC-N PS GCI- JHQEH NORMAL 2nd_del BREAST-PS 49-(63)-Am-N PS Ambion 26486 NORMAL BREAST-PS 50-GC-N PS GCI- ONBFK NORMAL 2nd_del BREAST-PS 51-GC-N PS GCI- TG6J6 NORMAL 1st_del BREAST-PS 52-As-N PS Asterand 14398 NORMAL BREAST-PS 54-GC-N PS GCI- AJGXV NORMAL 2nd_del BREAST-PS 56-GC-N PS GCI- HLCZX NORMAL 1st_del BREAST-PS 58-GC-N PS GCI- FGV8P NORMAL 1st_del BREAST-PS 59-As-N PS Asterand  9264 NORMAL BREAST-PS 60-(57)-Bc-N PM Biochain A609233 NORMAL BREAST-PM 61-(59)-Bc-N PM Biochain A607155 NORMAL BREAST-PM 62-(60)-Bc-N PM Biochain A609234 NORMAL BREAST-PM 63-(66)-Am-N PM Ambion 36678 NORMAL BREAST-PM 64-(64)-Am-N PM Ambion 23036 NORMAL BREAST-PM 66-(67)-Am-N PM Ambion 073P010602086A NORMAL BREAST-PM 67-(58)-Bc-N PM Biochain A609232 NORMAL BREAST-PM 68-As-N PM Asterand 8862 NORMAL BREAST-PM 69-As-N PM Asterand 8457 NORMAL BREAST-PM 70-(43)-Bc-IDC Biochain A609183 INFILTRATING DUCTAL CARCINOMA 71-(54)-Bc-IDC Biochain A605353 INFILTRATING DUCTAL CARCINOMA 72-(55)-Bc-IDC ABS A609179 INFILTRATING DUCTAL CARCINOMA 73-(47)-Bc-IDC Biochain A609221 INFILTRATING DUCTAL CARCINOMA 74-(48)-Bc-IDC Biochain A609222 INFILTRATING DUCTAL CARCINOMA 75-(53)-Bc-IDC Biochain A605151 INFILTRATING DUCTAL CARCINOMA 76-(61)-Bc-IDC Biochain A610029 INFILTRATING DUCTAL CARCINOMA 77-(46)-Bc-Carci Biochain A609177 Carcinoma 78-(62)-Bc-IDC Biochain A609194 INFILTRATING DUCTAL CARCINOMA 79-(32)-AB-Muc Carci Ambion 7116T Mucinous STAGE IIA SIIA carcinoma 80-(49)-Bc-IDC Biochain A609223 INFILTRATING DUCTAL CARCINOMA 81-(45)-Bc-IDC Biochain A609181 INFILTRATING DUCTAL CARCINOMA 82-(50)-Bc-IDC Biochain A609224 INFILTRATING DUCTAL CARCINOMA 83-(44)-Bc-IDC Biochain A609198 INFILTRATING DUCTAL CARCINOMA 84-(51)-Bc-IDC Biochain A605361 INFILTRATING DUCTAL CARCINOMA 85-(31)-Ic-IDC Ambion CG-154 INFILTRATING DUCTAL CARCINOMA

TABLE 3 Lung Panel RNA Details sample name Source sample _id DIAGNOSIS CANCER_STAGE 1-GC-BAC-SIA GCI- 7Z9V4 ADENOCARCINOMA STAGE IA 1st_del 2-GC-BAC-SIB GCI- ZW2AQ ADENOCARCINOMA STAGE IB 1st_del 4-GC-Adeno-SIA GCI- 3MOPL ADENOCARCINOMA STAGE IA 1st_del 5-GC-Adeno-SIA GCI- KOJXD ADENOCARCINOMA STAGE IA 1st_del 6-GC-Adeno-SIA GCI- X2Q44 ADENOCARCINOMA STAGE IA 1st_del 8-GC-Adeno-SIA GCI- BS9AF ADENOCARCINOMA STAGE IA 1st_del 9-GC-Adeno-SIA GCI- UCLOA ADENOCARCINOMA STAGE IA 1st_del 10-GC-Adeno-SIA GCI- BVYK3 ADENOCARCINOMA STAGE IA 1st_del 11-GC-Adeno-SIB GCI- U4DM4 ADENOCARCINOMA STAGE IB 1st_del 12-GC-Adeno-SIB GCI- OWX5Y ADENOCARCINOMA STAGE IB 1st_del 13-GC-Adeno- GCI- XYY96 ADENOCARCINOMA STAGE IIA SIIA 1st_del 14-GC-Adeno- GCI- SO7B1 ADENOCARCINOMA STAGE IIA SIIA 1st_del 15-GC-Adeno- GCI- QANSY ADENOCARCINOMA STAGE IIIA SIIIA 1st_del 18-(76)-Bc-Adeno Biochain A609218 ADENOCARCINOMA 19-As-Sq-S0 Asterand  9220 Squamous Cell Carcinoma Occult 20-GC-Sq-SIA GCI- U2QHS Squamous Cell Carcinoma STAGE IA 1st_del 21-GC-Sq-SIB GCI- TRQR7 Squamous Cell Carcinoma STAGE IB 2nd_del 22-As-Sq-SIB Asterand 17581 Squamous Cell Carcinoma STAGE IB 23-As-Sq-SIB Asterand 18309 Squamous Cell Carcinoma STAGE IB 24-As-Sq-SIB Asterand  9217 Squamous Cell Carcinoma STAGE IB 25-GC-Sq-SIIB GCI- RXQ1P Squamous Cell Carcinoma STAGE IIB 1st_del 26-GC-Sq-SIIB GCI- KB5KH Squamous Cell Carcinoma STAGE IIB 1st_del 27-GC-Sq-SIIIA GCI- LAYMB Squamous Cell Carcinoma STAGE IIIA 1st_del 30-(19)-Bc-Sq Biochain A408175 Squamous Cell Carcinoma 31-(78)-Bc-Sq Biochain A607125 Squamous Cell Carcinoma 33-(80)-Bc-Sq Biochain A609163 Squamous Cell Carcinoma 34-(18)-Bc-Sq Biochain A503387 Squamous Cell Carcinoma 35-(81)-Bc-Sq Biochain A609076 Squamous Cell Carcinoma 36-GC-LCC-SIA GCI- AF8AL LARGE CELL CARCINOMA STAGE IA 1st_del 37-GC-LCC-SIB GCI- O62XU LARGE CELL CARCINOMA STAGE IB 1st_del 38-GC-LCC-SIB GCI- OLOIM LARGE CELL CARCINOMA STAGE IB 2nd_del 39-GC-LCC-SIIB GCI- 1ZWSV LARGE CELL CARCINOMA STAGE IIB 4th_del 41-GC-LCC-SIIB GCI- 38B4D LARGE CELL CARCINOMA STAGE IIB 1st_del 42-GC-SCC-SIB GCI- QPJQL SMALL CELL CARCINOMA STAGE IB 1st_del 43-(32)-Bc-SCC Biochain A501391 SMALL CELL CARCINOMA 44-(30)-Bc-SCC Biochain A501389 SMALL CELL CARCINOMA 45-(83)-Bc-SCC Biochain A609162 SMALL CELL CARCINOMA 46-(86)-Bc-SCC Biochain A608032 SMALL CELL CARCINOMA 47-(31)-Bc-SCC Biochain A501390 SMALL CELL CARCINOMA 48-(84)-Bc-SCC Biochain A609167 SMALL CELL CARCINOMA 49-(85)-Bc-SCC Biochain A609169 SMALL CELL CARCINOMA 50-(33)-Bc-SCC Biochain A504115 SMALL CELL CARCINOMA 5 1-As-N-PS Asterand  9078 Normal lung 52-As-N-PM Asterand  8757 Normal lung 53-As-N-PM Asterand  6692 Normal lung 54-As-N-PM Asterand  7900 Normal lung 55-As-N-PM Asterand  8771 Normal lung 56-As-N-PM Asterand 13094 Normal lung 57-As-N-PM Asterand 19174 Normal lung 58-As-N-PM Asterand 13128 Normal lung 59-As-N-PM Asterand 14374 Normal lung 60-(99)-Am-N PM Ambion 36856 Normal PM 61-(96)-Am-N PM Ambion 36853 Normal PM 62-(97)-Am-N PM Ambion 36854 Normal PM 63-(93)-Am-N PM Ambion 111P0103A Normal PM 64-(98)-Am-N PM Ambion 36855 Normal PM 69-(91)-Bc-N PM Biochain A607257 Normal (Pool 2) PM 70-(90)-Bc-N PM Biochain A608152 Normal (Pool 2) PM

TABLE 4 Healthy panel RNA Details: sample name Source Sample id 1-Bc-Rectum Biochain A610297 2-Bc-Rectum Biochain A610298 3-GC-Colon GCI ZJ17R 4-GC-Colon GCI YUZNR 5-GC-Colon GCI 28QN6 6-Bc-Colon Biochain A501156 7-GC-Small bowel GCI V9L7D 8-Bc-Esoph Biochain A603814 9-Bc-Esoph Biochain A603813 10-As-Panc Asterand    8918 11-As-Panc Asterand   10082 12-As-Liver Asterand    7916 13-GC-Kidney GCI N1EVZ 14-GC-Kidney GCI BMI6W 15-Bc-Adrenal Biochain A610374 16-Am-Lung Ambion 111P0103A 17-Bc-Lung Biochain A503205 18-As-Lung Asterand    6692 19-As-Lung Asterand    7900 20-Am-Ovary Asterand   16848 21-GC-Ovary GCI Y9VHI 22-GC-Ovary GCI DD73B 23-GC-Ovary GCI FDPL9 24-GC-Cervix GCI E2P2N 25-ABS-Bladder ABS 150300503 26-ABS-Bladder ABS 150700103 27-ABS-Bladder ABS 150700203 28-Am-Placen Ambion 021P33A 29-Bc-Placen Biochain A411073 30-Am-Breast Ambion   26486 31-Am-Breast Ambion   23036 32-GC-Breast GCI E6UDD 33-Bc-Breast Biochain A609234 34-Am-Prostate Ambion   25955 35-Bc-Prostate Biochain A609258 36-As-Testis Asterand   13071 37-As-Testis Asterand   19671 38-TH-Blood-PBMC Tel-Hashomer   52497 39-TH-Blood-PBMC Tel-Hashomer   31055 40-TH-Blood-PBMC Tel-Hashomer   31058 41-Ic-Spleen Ichilov CG-267 42-ABS-Spleen ABS 150800704 43-ABS-Spleen ABS 150800904 44-ABS-Spleen ABS 150801804 45-ABS-Thymus ABS   13066 46-ABS-Thymus ABS   13105 47-ABS-Thymus ABS   133968 48-Bc-Thyroid Biochain A610287 49-Ic-Thyroid Ichilov CG-119-2 50-GC-Sali gland GCI NNSMV 51-Ic-Cerebellum Ichilov CG-183-5 52-Bc-Brain Biochain A411322 53-Bc-Brain Biochain A411079 54-ABS-Heart ABS 151101109 55-ABS-Heart ABS 352081026 56-ABS-Heart ABS 352JA02409 57-Ic-Heart (Fibrotic) Ichilov CG-255-9 58-GC-Skel Mus GCI T8YZS 59-GC-Skel Mus GCI Q3WKA 60-As-Skel Mus Asterand    8774 61-As-Skel Mus Asterand   10937 62-As-Skel Mus Asterand    6692 63-ABS-Skin ABS 151104009 64-ABS-Skin ABS 352MC01909 65-ABS-Skin ABS 150402309

TABLE 5 Kidney Panel RNA Details Cancer Sample Name Source Sample ID Diagnosis Stage 1_AB_K_PM-N ABS ABS150303105 Alzheimer's 2_AB_K_PM-N ABS ABS151200305 Alzheimer's 3_AB_K_PM-N ABS AB5151201805 Cardio Vascular Disease 4_AB_K_PM-N ABS AB524724672102 COPD 5_AB_K_RCC_ST2aN0MX ABS UH1003-29 RCC ST2aN0MX 7_AS_K_RCC_ST3aN0M1 Asterand 52813 (1066748F- RCC ST3aN0M1 3152) 8_AS_K_RCC_ST3NXM1 Asterand 52819 (1066176F- RCC ST3NXM1 3152) 9_OR_K RCC_ST4N1MX Origene CI0000011656 RCC ST4N1MX (1A26) 10_OR_K RCC_ST3aN0M1 Origene CU0000001623 RCC 5T3aN0M1 (3714) 11_OR_K RCC_ST3N2M1 Origene CU0000009324 RCC ST3N2M1 (1A1A) 12_OR_K RCC_ST2NXMX Origene CX0000000190 RCC ST2NXMX (3D99) 13_OR_K RCC_ST2N0M1 Origene CU0000005834 RCC ST2N0M1 (34DD) 14_OR_K RCC_ST3bN0MX Origene CU0000000762 RCC ST3bN0MX (374D) 15_OR_K RCC_ST3NXMX Origene C10000016503 RCC ST3NXMX (3743) 16_OR_K RCC_ST3aNXMX Origene CU0000001216 RCC ST3aNXMX (3711) 17_AB_K RCC_ST2N0MX ABS UH1002-14 RCC ST2N0MX 18_AB_K RCC_ST2bN0M1 ABS UH1007-18 RCC ST2bN0M1 19_AB_K PM-N ABS ABS150400105 ALS

TABLE 6 Liver Panel RNA Details Cancer Sample Name Source Sample ID Diagnosis Stage 41_AB_L_PM-N ABS ABS151203707 Alzheimer's 42_AB_L_PM-N ABS ABS151003509 Dementia 43_AS_L_PM-N Asterand 49874 (1143071F- 3152) Respiratory arrest 44_AS_L_PM-N Asterand 50466 (1144029F- 3152) Unknown 45_AS_L_PM-N Asterand 50483 (1144465F- Cardiopulmonary 3152) arrest 46_AB_L_HCC_ST2N1MX ABS UH0603-43 HCC T2N1MX 47_AB_L_HCC_ST3N0MX ABS UH0901-55 HCC T3N0MX 48_AS_L_HCC_ST3N0M0 Asterand 51356 (1100251F- HCC T3N0M0 3152) 49_AS_L_HCC_ST4NXMX Asterand 51365 (1100271F- HCC T4NXMX 3152) 50_AS_L_HCC_ST2N0M0 Asterand 52528 (1149074F- HCC T2N0M0 3152) 51_OR_L_HCC_ST2N0MX Origene C10000008358 HCC T2N0MX (1A25) 52_OR_L_HCC_ST2NXMX Origene C10000009200 HCC T2NXMX (14B1) 53_OR_L_HCC_STXNXM1 Origene C10000013002 HCC TXNXM1 (30B6) 54_OR_L_HCC_ST3NXM1 Origene C10000020838 HCC T3NXM1 (2445) 55_OR_L_HCC_ST3NXMX Origene CU0000000996 HCC T3NXMX (15F6) 56_OR_L_HCC_ST3NXMX Origene CU0000001197 HCC T3NXMX (02DE) 57_OR_L_HCC_ST3NXMX Origene C10000019267 HCC T3NXMX (2441) 58_OR_L_HCC_ST2NXMX Origene CU0000005407 HCC T2NXMX (0F2D) 59_OR_L_HCC_ST2NXMX Origene CU0000006675 HCC T2NXMX (0F2E)

TABLE 7 Housekeeping Genes For Rev HSKG primer For primer Rev Amplicon Accession Seq seq primer seq primer seq Amplicon HSKG number ID ID sequence ID sequence id sequence SDHA NM_004168 103 104 TGGGAA 105 CCACC 106 TGGGAACAAG CAAGAG ACTGC AGGGCATCTG GGCATC ATCAA CTAAAGTTTC TG ATTCA AGATTCCATTT TG CTGCTCAGTAT CCAGTAGTGG ATCATGAATTT GATGCAGTGG TGG HPRTI NM_000194 107 108 TGACACT 109 GGTCCT 110 TGACACTGGCAA GGCAAAA TTTCACC AACAATGCAGAC CAATGCA AGCAAG TTTGCTTTCCTTG CT GTCAGGCAGTAT AATCCAAAGATG GTCAAGGTCGCA AGCTTGCTGGTG AAAAGGACC G6PD NM_000402 111 112 GAGGCCG 113 GGACAG 114 GAGGCCGTCACC TCACCAA CCGGTC AAGAACATTCAC GAACAT AGAGCT GAGTCCTGCATG C AGCCAGATAGGC TGGAACCGCATC ATCGTGGAGAAG CCCTTCGGGAGG GACCTGCAGAGC TCTGACCGGCT GTCC UBC BC000449 133 134 ATTTGGG 135 TGCCTT 136 ATTTGGGTCGCGG TCGCGGT GACATT TTCTTGTTTGTGG TCTTG CTCGAT ATCGCTGTGATCG GGT TCACTTGACAATG CAGATCTTCGTGA AGACTCTGACTG GTAAGACCATCAC CCTCGAGGTTGA GCCCAGTGACAC CATCGAGAATGT CAAGGCA RPL19 NM_000981 119 120 TGGCAAG 121 TGATCA 122 TGGCAAGAAGAA AAGAAGG GCCCAT GGTCTGGTTAGA TCTGGTTA CTTTGAT CCCCAATGAGAC G GAG CAATGAAATCGCC AATGCCAACTCCC GTCAGCAGATCC GGAAGCTCATCA AAGATGGGCTGA TCA PBGD BC019323 115 116 TGAGAGT 117 CCAGGG 118 TGAGAGTGATTC GATTCGC TACGAG GCGTGGGTACCC GTGGG GCTTTC GCAAGAGCCAGC AAT TTGCTCGCATAC AGACGGACAGTGT GGTGGCAACATT GAAAGCCTCGTA CCCTGGCCCTGG

Specific primers and amplicons used for expression analysis of LSR transcripts are provided in Table 8.

TABLE 8 LSR Primers and Amplicons For Rev Amplicon primer primer Rev SEQ Forward SEQ For Reverse SEQ primer Amplicon ID Amplicon primer ID primer primer ID se- name NO sequence name NO sequence name NO quence LSR_ 137 GTCGA LSR_ 138 GTCGA LSR_ 139 AAGGT seg2 CAACC seg CAACC seg2 CAGGT 1-24_ AGCTC 21F_ AGCTC 4R_ CAGCA 200- AATGC 200- AATGC 200- TTTCC 307/ CCAGC 307 308 308_ TGGCA Amplicon GCCGG GAACC CAGGC TACAA CCCCT ACGTC GAGTG CCAGG ACAGC GTGCG CACCG TCAGG GTCGT GGCCA CCAAG CAGGG CAACG CTGTG ACCCT GGGAG ATTAC TACCA GGGCC GGAGG ATTAC CATCA CCGGA AATGC TGACC TGACC TT LSR_ 140 ATGCT LSR_ 141 ATGCT LSR_ 142 CCAGG seg2 GACCT seg GACCT seg3 TAAGA 4-36_ GACCT 24F_ GACCT 6R_ GCTCA 200- TTGAC 200- TTGAC 200- GCCAC 309/ CAGAC 309 310 310_ GGCGT Amplicon GGGGG GACAG TGGTG TGTAT TACTG CTCCG TGGTC TCAGC CCAGG ACCTC CAGGG GAACA ATGAG GCCTA CGCAG AGCTC ATCGT CCTTG GGAGG ACCTC AGGGG TGGCT GAGCT CTTAC CTGG Specific primers and amplicons used for expression analysis of TMEM25 transcript is provided in Table 9.

TABLE 9 TMEM25 primers and amplicons For- For For Rev Rev Amplicon Amplicon ward primer primer Reverse primer primer Amplicon SEQ se- primer SEQ se- primer SEQ se- name ID NO quence name ID NO quence name ID NO quence TMEM25_ 123 TTCAC TMEM25_ 124 TTCA TMEM25_ 125 CACC Seg_21- TGTC seg21_ CTGT seg27R_ AGGG 27_200- ACTG F_200- CACT 200- CAAA 344/ CCCA 344 GCCC 346 CAGG 346_ TCGG ATCG ACAA Amplicon GCCC G C AGCA TGAG CTCA ACTG CTCT CTGC AGGA CCCC AGAA GTGG CCGA TCAG CCAA CGCC TCTG TCAT CCTT AATG TGCA ATTC AAGC CAGA GATT GCCC AAGT CGGC GCCA AGTA CCAG GAAG CTCA GGGC CCAG GCCT CCTG GTTG TCCT GTTT GCCC TGGT G The expression data of LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) is described in Examples 3-9 below.

Example 3

Expression of LSR Transcripts which are Detectable by Amplicon as Depicted in Sequence Name LSR_seg24-36_200-309/310 in Normal and Cancerous Ovary Tissues

Expression of LSR transcripts detectable by or according to LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) and primers LSR_seg24F_200-309 (SEQ ID:141) and LSR_seg36R_200-310 (SEQ ID:142) was measured by real time PCR. Non-detected samples (sample(s) no. 28) were assigned Ct value of 41 and were calculated accordingly. In parallel the expression of several housekeeping genes—SDHA (SEQ ID:103) (GenBank Accession No. NM_004168; amplicon—SDHA_Amplicon (seq ID: 106)), HPRT1 (SEQ ID:107) (GenBank Accession No. NM_000194; HPRT1_Amplicon (SEQ ID:110)), and G6PD (SEQ ID:111) (GenBank Accession No. NM_000402; G6PD_Amplicon (SEQ ID:1114)) was measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in normalization method 2 in the “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the normal samples (sample numbers 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 and 64, Table 1 above), to obtain a value of fold up-regulation for each sample relative to median of the normal samples.

FIG. 12 is a histogram showing over expression of the above-indicated LSR transcripts in cancerous Ovary samples relative to the normal samples.

As is evident from FIG. 12, the expression of LSR transcripts detectable by the above amplicon in serous carcinoma, mucinous carcinoma and adenocarcinoma samples was significantly higher than in the non-cancerous samples (sample numbers 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 and 64, Table 1 above). Notably an over-expression of at least 5 fold was found in 21 out of 27 serous carcinoma samples, in 7 out of 9 mucinous carcinoma samples and in 7 out of 8 endometroid carcinoma samples.

Statistical analysis was applied to verify the significance of these results, as described below.

The P value for the difference in the expression levels of LSR transcripts detectable by the above amplicon in Ovary serous carcinoma samples versus the normal tissue samples was determined by T test as 2.22e-002. The P value for the difference in the expression levels of LSR transcripts detectable by the above amplicon in Ovary mucinous carcinoma samples versus the normal tissue samples was determined by T test as 6.84e-004. The P value for the difference in the expression levels of LSR transcripts detectable by the above amplicon in Ovary endometroid carcinoma samples versus the normal tissue samples was determined by T test as 4.61e-003. The P value for the difference in the expression levels of LSR transcripts detectable by the above amplicon in Ovary Adenocarcinoma samples versus the normal tissue samples was determined by T test as 5.68e-004.

Threshold of 5 fold over expression was found to differentiate between serous carcinoma and normal samples with P value of 2.59e-009 as checked by exact Fisher test. Threshold of 5 fold over expression was found to differentiate between mucinous carcinoma and normal samples with P value of 8.43e-006 as checked by exact Fisher test. Threshold of 5 fold over expression was found to differentiate between endometroid carcinoma and normal samples with P value of 2.38e-006 as checked by exact Fisher test. Threshold of 5 fold over expression was found to differentiate between Adenocarcinoma samples and normal samples with P value of 7.28e-012 as checked by exact Fisher test.

The above values demonstrate statistical significance of the results.

Primer pairs are also optionally and preferably encompassed within the present invention; for example, for the above experiment, the following primer pair was used as a non-limiting illustrative example only of a suitable primer pair: LSR_seg24F_200-309 (SEQ ID:141); and LSR_seg36R_200-310 (SEQ ID:142).

The present invention also preferably encompasses any amplicon obtained through the use of any suitable primer pair; for example, for the above experiment, the following amplicon was obtained as a non-limiting illustrative example only of a suitable amplicon: LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140).

Example 4

Expression of LSR Transcripts which are Detectable by Amplicon as Depicted in Sequence Name LSR_seg24-36_200-309/310 in Normal and Cancerous Breast Tissues

Expression of LSR transcripts detectable by or according to seg24-36FR-LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) and primers LSR_seg24F_200-309 (SEQ ID:141) and LSR_seg36R_200-310 (SEQ ID:142) was measured by real time PCR. Non-detected samples (sample(s) no. 81) were assigned Ct value of 41 and were calculated accordingly. In parallel the expression of several housekeeping genes—G6PD (SEQ ID:111) (GenBank Accession No. NM_000402; G6PD_Amplicon), PBGD (SEQ ID:115) (GenBank Accession No. BC019323; PBGD_Amplicon) RPL19 (SEQ ID:119) (GenBank Accession No. NM_000981RPL19_Amplicon) and SDHA (SEQ ID:103) (GenBank Accession No. NM_004168SDHA_Amplicon) was measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in normalization method 2 in the “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the normal samples (sample numbers 43, 45, 46, 47, 48, 49, 50, 51, 52, 54, 56, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68 and 69, Table 2 above), to obtain a value of fold up-regulation for each sample relative to median of the normal samples.

FIG. 13 is a histogram showing over expression of the above-indicated LSR transcripts in cancerous Breast samples relative to the normal samples.

As is evident from FIG. 13, the expression of LSR transcripts detectable by the above amplicon in cancer samples was higher than in the non-cancerous samples (sample numbers 43, 45, 46, 47, 48, 49, 50, 51, 52, 54, 56, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68 and 69, Table 2 above). Notably an over-expression of at least 5 fold was found in 9 out of 53 adenocarcinoma samples.

Primer pairs are also optionally and preferably encompassed within the present invention; for example, for the above experiment, the following primer pair was used as a non-limiting illustrative example only of a suitable primer pair: LSR_seg24F_200-309 (SEQ ID: 141); and LSR_seg36R_200-310 (SEQ ID: 142).

The present invention also preferably encompasses any amplicon obtained through the use of any suitable primer pair; for example, for the above experiment, the following amplicon was obtained as a non-limiting illustrative example only of a suitable amplicon: LSR_seg24-36_200-309/310_Amplicon (SEQ ID: 140).

Example 5

Expression of LSR Transcripts which are Detectable by Amplicon as Depicted in Sequence Name LSR_seg24-36_200-309/310 in Normal and Cancerous Lung Tissues

Expression of LSR transcripts detectable by or according to seg24-36FR LSR_seg24-36_200-309/310_Amplicon (SEQ ID:140) and primers LSR_seg24F_200-309 (SEQ ID:141) and LSR_seg36R_200-310 (SEQ ID:142) was measured by real time PCR. In parallel the expression of several housekeeping genes—HPRT1 (SEQ ID:107) (GenBank Accession No. NM_000194 HPRT1_Amplicon (SEQ ID:110)), PBGD (SEQ ID:115) (GenBank Accession No. BC019323; PBGD_Amplicon (SEQ ID:118)), SDHA (SEQ ID:103) (GenBank Accession No. NM_004168; SDHA_Amplicon (SEQ ID:106)) and Ubiquitin (SEQ ID:133) (GenBank Accession No. BC000449; Ubiquitin_Amplicon (SEQ ID:136)) was measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in normalization method 2 in the “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the normal samples (sample numbers 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 69 and 70, Table 3 above), to obtain a value of fold up-regulation for each sample relative to median of the normal samples.

FIG. 14 is a histogram showing over expression of the above-indicated LSR transcripts in cancerous Lung samples relative to the normal samples.

As is evident from FIG. 14, the expression of LSR or transcripts detectable by the above amplicon in adenocarcinoma and non-small cell carcinoma samples was significantly higher than in the non-cancerous samples (sample numbers 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 69 and 70, Table 3 above) and was higher in a few squamous cell carcinoma samples than in the non-cancerous samples. Notably an over-expression of at least 5 fold was found in 7 out of 15 adenocarcinoma samples, in 3 out of 18 squamous cell carcinoma samples and in 10 out of 40 non-small cell carcinoma samples.

Statistical analysis was applied to verify the significance of these results, as described below.

The P value for the difference in the expression levels of Homo sapiens lipolysis stimulated lipoprotein receptor transcripts detectable by the above amplicon in Lung adenocarcinoma samples versus the normal tissue samples was determined by T test as 2.98e-005. The P value for the difference in the expression levels of LSR transcripts detectable by the above amplicon in Lung squamous cell carcinoma samples versus the normal tissue samples was determined by T test as 7.42e-003. The P value for the difference in the expression levels of Homo sapiens lipolysis stimulated lipoprotein receptor transcripts detectable by the above amplicon in Lung large cell carcinoma samples versus the normal tissue samples was determined by T test as 1.76e-002. The P value for the difference in the expression levels of Homo sapiens lipolysis stimulated lipoprotein receptor transcripts detectable by the above amplicon in Lung small cell carcinoma samples versus the normal tissue samples was determined by T test as 4.35e-002. The P value for the difference in the expression levels of Homo sapiens lipolysis stimulated lipoprotein receptor transcripts detectable by the above amplicon in Lung non-small cell carcinoma samples versus the normal tissue samples was determined by T test as 4.31e-006.

Threshold of 5 fold over expression was found to differentiate between adenocarcinoma and normal samples with P value of 3.16e-003 as checked by exact Fisher test. Threshold of 5 fold over expression was found to differentiate between non-small cell carcinoma and normal samples with P value of 2.90e-002 as checked by exact Fisher test.

The above values demonstrate statistical significance of the results.

Primer pairs are also optionally and preferably encompassed within the present invention; for example, for the above experiment, the following primer pair was used as a non-limiting illustrative example only of a suitable primer pair: LSR_seg24F_200-309 (SEQ ID: 141).; and LSR_seg36R_200-310 (SEQ ID: 142).

The present invention also preferably encompasses any amplicon obtained through the use of any suitable primer pair; for example, for the above experiment, the following amplicon was obtained as a non-limiting illustrative example only of a suitable amplicon: LSR_seg24-36_200-309/310_Amplicon (SEQ ID: 140).

Example 6

Expression of LSR Transcripts which are Detectable by Amplicon as Depicted in Sequence Name LSR_seg24-36_200-309/310 in Different Normal Tissues

Expression of LSR transcripts detectable by or according to seg24-36FR LSR_seg24-36_200-309/310_Amplicon (SEQ ID: 140) and primers LSR_seg24F_200-309 (SEQ ID:141) and LSR_seg36R_200-310 (SEQ ID: 142) was measured by real time PCR. In parallel the expression of several housekeeping genes—SDHA (SEQ ID:103) (GenBank Accession No. NM_004168; SDHA_Amplicon (SEQ ID:106)), HPRT1 (SEQ ID:107) (GenBank Accession No. NM_000194; HPRT1_Amplicon (SEQ ID:110)), and G6PD (SEQ ID:111) (GenBank Accession No. NM_000402; G6PD_Amplicon (SEQ ID:114)) was measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in normalization method 2 in the “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the Ovary samples (sample numbers 20, 21, 22 and 23, Table 4 above), to obtain a value of relative expression of each sample relative to median of the Ovary samples.

FIG. 15 is a histogram showing the expression of the above-indicated LSR transcripts in normal tissue samples relative to the ovary samples.

Example 7

Expression of LSR Transcripts which are Detectable by Amplicon as Depicted in Sequence Name LSR_seg24-36_200-309/310 in Normal and Cancerous Kidney Tissues

Expression of LSR transcripts detectable by or according to seg24-36FR-LSR_seg24-36_200-309/310_Amplicon (SEQ ID: 140) and primers LSR_seg24F_200-309 (SEQ ID: 141) and LSR_seg36R_200-310 (SEQ ID: 142) was measured by real time PCR. In parallel the expression of several housekeeping genes—SDHA (SEQ ID:103) (GenBank Accession No. NM_004168; SDHA_Amplicon (SEQ ID:106)), G6PD (SEQ ID:111) (GenBank Accession No. NM_000402; G6PD_Amplicon (SEQ ID:114)) and PBGD (SEQ ID:115) (GenBank Accession No. BC019323; PBGD_Amplicon (SEQ ID:118)) was measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in normalization method 2 in the “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the normal samples (sample numbers 1, 2, 3, 4 and 19, Table 5 above), to obtain a value of fold up-regulation for each sample relative to median of the normal samples.

FIG. 16 is a histogram showing down regulation of the above-indicated Homo sapiens lipolysis stimulated lipoprotein receptor transcripts in cancerous Kidney samples relative to the normal samples.

As is evident from FIG. 16, the expression of LSR transcripts detectable by the above amplicon in cancerous Kidney samples was significantly lower than in the non-cancerous samples (sample numbers 1, 2, 3, 4 and 19, Table 5 above).

Statistical analysis was applied to verify the significance of these results, as described below.

The P value for the difference in the expression levels of LSR transcripts detectable by the above amplicon in cancerous Kidney samples versus the normal tissue samples was determined by T test as 1.25e-01.

Primer pairs are also optionally and preferably encompassed within the present invention; for example, for the above experiment, the following primer pair was used as a non-limiting illustrative example only of a suitable primer pair: LSR_seg24F_200-309 (SEQ ID: 141); and LSR_seg36R_200-310 (SEQ ID: 142).

The present invention also preferably encompasses any amplicon obtained through the use of any suitable primer pair; for example, for the above experiment, the following amplicon was obtained as a non-limiting illustrative example only of a suitable seg24-36_200-309/310_Amplicon (SEQ ID:140).

Example 8

Expression of LSR Transcripts which are Detectable by Amplicon as Depicted in Sequence Name LSR_seg24-36_200-309/310 in Normal and Cancerous Liver Tissues

Expression of LSR transcripts detectable by or according to seg24-36FR seg24-36_200-309/310_Amplicon (SEQ ID: 140) and primers LSR_seg24F_200-309 (SEQ ID: 141) and LSR_seg36R_200-310 (SEQ ID: 142) was measured by real time PCR. In parallel the expression of several housekeeping genes—SDHA (SEQ ID:103) (GenBank Accession No. NM_004168; SDHA_Amplicon (SEQ ID: 106)), G6PD (SEQ ID:111) (GenBank Accession No. NM_000402; G6PD_Amplicon (seq ID:114)) and PBGD (SEQ ID: 115) (GenBank Accession No. BC019323; —PBGD_Amplicon (SEQ ID:118)) was measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in normalization method 2 in the “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the normal samples (sample numbers 41, 42, 43, 44 and 45, Table 6 above), to obtain a value of fold up-regulation for each sample relative to median of the normal samples.

FIG. 17 is a histogram showing the expression of the above-indicated LSR transcripts in cancerous Liver samples relative to the normal samples.

Primer pairs are also optionally and preferably encompassed within the present invention; for example, for the above experiment, the following primer pair was used as a non-limiting illustrative example only of a suitable primer pair: LSR_seg24F_200-309 (SEQ ID: 141); and LSR_seg36R_200-310 (SEQ ID: 142) reverse primer.

The present invention also preferably encompasses any amplicon obtained through the use of any suitable primer pair; for example, for the above experiment, the following amplicon was obtained as a non-limiting illustrative example only of a suitable amplicon: LSR_seg24-36_200-309/310_Amplicon (SEQ ID: 140).

Example 9 Cloning of LSR_T1_P5a Orf Fused to Flag Tag

Cloning of LSR_T1_P5a open reading frame (ORF) (SEQ ID NO 154) fused to FLAG (amino acid sequence: DYKDDDDK, SEQ ID NO: 153) to generated LSR_P5a protein (SEQ ID NO: 11) fused to flag, was performed by PCR as described below.

A 3-step PCR reaction was performed using PfuUltra II Fusion HS DNA Polymerase (Agilent, Catalog no. 600670) under the following conditions: on the first step, 1 μl of undiluted Ovary sample (ID PZQXH) from the Ovary panel (Table 1) served as a template for a PCR reaction with 0.5 μl of each of the primers 200_369_LSR_Kozak_NheI (SEQ ID NO: 147) and 200_379_LSR_Rev (SEQ ID NO: 148) in a total reaction volume of 250 The reaction conditions were 5 minutes at 98° C.; 35 cycles of: 20 seconds at 98° C., 30 seconds at 55° C. and 1.5 minutes at 72° C.; then 5 minutes at 72° C. The PCR product was diluted 1:20 in DDW and 1 ul was used as a template for each of the PCR reactions on step 2.

For the second step the 5′ part of LSR was amplified with 0.5 ul of each of the primers 200_369_LSR_Kozak_NheI (10 μM) (SEQ ID NO: 147) and 200_371_LSR_seg36R (10 uM) (SEQ ID NO: 149) in a total reaction volume of 250 The 3′ part of LSR was amplified with 0.5 ul of each of the primers 200_370_LSR_seg36F (10 μM) (SEQ ID NO: 150) and 200-373_LSR_Flag_BamHI_Rev (10 uM) (SEQ ID NO: 151) in a total reaction volume of 25 μl. The reaction conditions for both reactions were 5 minutes at 98° C.; 35 cycles of: 20 seconds at 98° C., 15 seconds at 60° C. and 1.5 minutes at 72° C.; then 5 minutes at 72° C. The products of each of the reactions were separated on 1% agarose gel and purified from the gel using Qiaquick™ Gel Extraction Kit (Qiagene, Catalog no. 28706). 100 ng of the 5′ product and 100 ng of the 3′ product were used as a template for the third step of the PCR reaction, in which the full LSR-Flag sequence was amplified. 0.5 μl of each of the primers 200_369_LSR_Kozak_NheI (SEQ ID NO: 147) and 200-373_LSR_Flag_BamHI_Rev (SEQ ID NO: 151) in a total reaction volume of 25 μl. The reaction conditions were 5 minutes at 98° C.; 35 cycles of: 20 seconds at 98° C., 30 seconds at 55° C. and 1.5 minutes at 72° C.; then 5 minutes at 72° C. All of the primers that were used include gene specific sequences, restriction enzyme sites, Kozak sequence and FLAG tag sequence. The PCR product of step 3 was separated on 1% agarose gel. After verification of the expected band size, the PCR product was purified using QIAquick™ Gel Extraction kit.

The purified full length PCR product was digested with NheI and BamHI restriction enzymes (New England Biolabs, Beverly, Mass., U.S.A.). After digestion, the DNA was separated on a 1% agarose gel. The expected band size was excised and extracted from the gel as described above. The digested DNA was then ligated into pIRESpuro3 vector that was digested with NheI and BamHI as described above, treated with Antarctic Phosphatase (New England Biolabs, Beverly, Mass., U.S.A., Catalog no. M0289L) for 30 minutes at 37° C. and purified from 1% agarose gel using QIAquick™ Gel Extraction kit as described above. The ligation reaction was performed with T4 DNA Ligase (Promega; Catalog no. M180A).

Example 10 Cloning of LSR_T1_P5a ORF

Cloning of LSR_T1_P5a open reading frame (ORF) (SEQ ID NO: 154) was performed by PCR to generate LSR_P5a protein (SEQ ID NO: 11), as described below.

A PCR reaction was performed using PfuUltra II Fusion HS DNA Polymerase (Agilent, Catalog no. 600670) under the following conditions: 50 ng of pIRES_puro3_LSR_T1_P5a_Flag construct described above served as a template for a PCR reaction with 0.5 microliter of each of the primers 200_369_LSR_Kozak_NheI (SEQ ID NO: 147) and 200-372_LSR_BamHI_Rev (SEQ ID NO: 152) in a total reaction volume of 25 μl. The reaction conditions were 5 minutes at 98° C.; 35 cycles of: 20 seconds at 98° C., 30 seconds at 55° C. and 1.5 minutes at 72° C.; then 10 minutes at 72° C. All of the primers that were used include gene specific sequences, restriction enzyme sites and Kozak sequence. The PCR product was separated on 1% agarose gel. After verification of the expected band size, the PCR product was purified using QIAquick™ Gel Extraction kit as described above.

The purified PCR product was digested with NheI and BamHI restriction enzymes (New England Biolabs, Beverly, Mass., U.S.A.). After digestion, the DNA was separated on a 1% agarose gel. The expected band size was excised and extracted from the gel as described above. The digested DNA was then ligated into pIRESpuro3 vector that was digested with NheI and BamHI as described above, incubated with Antarctic Phosphatase (New England Biolabs, Beverly, Mass., U.S.A., Catalog no. M0289L) for 30 minutes at 37° C. and purified from 1% agarose gel using QIAquick™ Gel Extraction kit as described above. The ligation reaction was performed with T4 DNA Ligase (Promega; Catalog no. M180A).

Sequence verification of both tagged and untagged constructs described above was performed (Hylabs, Rehovot, Israel). Two nucleotides mismatches were identified, as follows: G to A at nucleic acid position 119 of SEQ ID NO: 154, and A to G at nucleic acid position 626 from SEQ ID NO: 154, resulting in a nucleic sequence set forth in SEQ ID NO: 145 for the untagged construct, and SEQ ID NO: 146 for the tagged construct; yielding a polypeptide having an amino acid mismatch I to M in amino acid position 209 in SEQ ID NO:301, resulting in a protein having amino acid sequence set forth in SEQ ID NO: 143 for the untagged construct and SEQ ID NO: 144 for the tagged construct. The above recombinant plasmids were processed for stable pool generation as described below.

Example 11 Establishment of a Stable Pool of Recombinant HEK293T Cells Expressing LSR_P5a_Flag_M Protein

HEK-293T cells were stably transfected with LSR_T1_P5a_Flag_m (SEQ ID NO: 146) and pIRESpuro3 empty vector plasmids as follows:

HEK-293T (ATCC, CRL-11268) cells were plated in a sterile 6 well plate suitable for tissue culture, containing 2 ml pre-warmed of complete media, DMEM [Dulbecco's modified Eagle's Media, Biological Industries (Beit Ha'Emek, Israel, catalog number: 01-055-1A)+10% FBS [Fetal Bovine Serum, Biological Industries (Beit Ha'Emek, Israel, catalog number: 04-001-1A)+4 mM L-Glutamine (Biological Industries (Beit Ha'Emek, Israel), catalog number: 03-020-1A). 500,000 cells per well were transfected with 2 μg of DNA construct using 6 μl FuGENE 6 reagent (Roche, catalog number: 11-814-443-001) diluted into 94 ul DMEM. The mixture was incubated at room temperature for 15 minutes. The complex mixture was added dropwise to the cells. The cells were placed in an incubator maintained at 3TC with 5% CO2 content. 48 hours after the transfection, the cells were transferred to a 75 cm2 tissue culture flask containing 15 ml of selection medium: complete medium supplemented with 5 μg\ml puromycin (Sigma, catalog number P8833). Cells were placed in an incubator, and the medium was replaced every 3-4 days, until clone formation was observed.

Example 12 Analysis of the Ectopic Expression of LSR_P5a_Flag_m in Stably-Transfected HEK293T Cells

The expression of LSR_P5a_Flag_m (SEQ ID NO 144) in stably-transfected HEK293T cells was determined by Western blot analysis of the cell lysates, using anti LSR Antibodies and anti flag antibody as indicated in Table 9.

Cells were dissociated from the plate using Cell Dissociation Buffer Enzyme-Free PBS-Based (Gibco; 13151-014), washed in Dulbecco's Phosphate Buffered Saline (PBS) (Biological Industries, 02*023-1A) and centrifuged at 1200 g for 5 minutes. Whole cell extraction was performed by resuspending the cells in 50 mM Tris-HCl pH7.4, 150 mM NaCl, 1 mM EDTA, 1% Triton X-100, supplemented with 25× complete EDTA free protease inhibitor cocktail (Roche, 11 873 580 001) and vortexing for 20 seconds. Cell extracts were collected following centrifugation at 20000 g for 20 minutes at 4° C. and protein concentration was determined with Bradford Biorad Protein Assay (Biorad cat #500-0006). Equal protein amounts were analyzed by SDS-PAGE (Invitrogen NuPAGE 4-12% NuPAGE Bis Tris, Cat #NP0335, NP0322) and transferred to Nitrocellulose membrane (BA83, 0.2 μm, Schleicher & Schuell, Cat #401385). The membrane was blocked with TTBS (Biolab, Cat #: 20892323)/10% skim milk (Difco, Cat #232100) and incubated with the indicated primary antibodies (FIG. 18) diluted in TTBS/5% BSA (Sigma-Aldrich, A4503) at the indicated concentrations (Table 9), for 16 hours at 4° C. After 3 washes with TTBS, The membrane was further incubated for 1 hour at Room Temperature with the secondary-conjugated antibodies as indicated, diluted in TTBS. Chemiluminescence reaction was performed with ECL Western Blotting Detection Reagents (GE Healthcare, Cat #RPN2209) and the membrane was exposed to Super RX Fuji X-Ray film (Catalog no. 4741008389).

FIG. 18 demonstrates the expression of LSR_P5a_Flag_m protein (SEQ ID: 144) in recombinant HEK293T cells at the expected band size ˜70 kDa, as detected with anti Flag (Sigma cat #A8592) (FIG. 18A) and anti LSR antibodies as follow: Abnova, cat #H00051599-B01P (FIG. 18B) Abcam, cat ab59646 (FIG. 18C) and Sigma cat #HPA007270 (FIG. 18D).

Example 13 Determination of the Subcellular Localization of the Ectopic LSR_P5a_Flag_m in HEK293T Cells

The subcellular localization of the LSR_P5a_Flag_m protein (SEQ ID NO: 144) was determined in stably-transfected cells by confocal microscopy.

Stably transfected recombinant HEK293T cells expressing a LSR_P5a_Flag_m (SEQ ID NO: 144) described above were plated on coverslips pre-coated with Poly-L-Lysine (Sigma; Catalogue no. P4832). After 24 hrs the cells were processed for immunostaining and analyzed by confocal microscopy. The cover slip was washed in phosphate buffered saline (PBS), then fixed for 15 minutes in a solution of PBS/3.7% paraformaldehyde (PFA) (EMS, catalog number: 15710)/3% glucose (Sigma, catalog number: G5767). The PFA was Quenched with PBS/3 mM Glycine (Sigma, catalog number: G7126) for 5 minutes. After two 5-minute washes in PBS, the cells were permeabilized with PBS/0.1% Triton-X100 for 5 minutes at Room Temperature and washed twice in PBS. Then, blocking of non-specific regions was performed with PBS/5% Bovine Serum Albumin (BSA) (Sigma, catalog number: A4503) for 20 minutes. The coverslip was then incubated in a humid chamber for 1 hour with each of the primary antibodies diluted in PBS/5% BSA as indicated, followed by three 5-minute washes in PBS. The coverslips were then incubated for 30 minutes with the corresponding secondary antibody diluted in PBS/2.5% BSA at the indicated dilution. The antibodies and the dilutions that were used are specified in Table 9. After a prewash in Hank's Balanced Salt Solutions w/o phenol red (HBSS) (Biological Industries Catalog no. 02-016-1), the coverslip was incubated with WGA-Alexa 488 (Invitrogen, catalog number W11261) diluted 1:200 in HBSS for 10 min, washed in HBSS and incubated in BISBENZIMIDE H 33258 (Sigma, catalog number: 14530) diluted 1:1000 in HBSS. The coverslip was then mounted on a slide with Gel Mount Aqueous medium (Sigma, catalog number: G0918) and cells were observed for the presence of fluorescent product using confocal microscopy.

The subcellular localization of LSR_P5a_Flag_m is demonstrated in FIG. 19, LSR_P5a_Flag_m (SEQ ID NO: 144) is localized mainly to the cell cytoplasm, but can also be detected on the cell surface as detected with anti Flag (Sigma cat #A9594) (FIG. 19A) and anti LSR antibodies as follows: Abcam, cat ab59646 (FIG. 19B) Abnova, cat #H00051599-B01P (FIG. 19C) and Sigma cat #HPA007270 (FIG. 19D).

Example 14 Analysis of the Expression of Endogenous LSR Protein in Various Cell Lines

The expression of endogenous LSR protein in various cell lines was analyzed by Western Blotting as described below.

SK-OV3 (ATCC no. HTB-77) Caov3 (ATCC no. HTB-75), OVCAR3 (ATCC no. HTB-161), ES-2 (ATCC no. CRL-1978), OV-90 (ATCC no. CRL-11732) TOV112D (ATCC no. CRL-11731) and Hep G2 (ATCC no. HB-8065) cell extracts were prepared as described above.

HeLa (catalog no. sc-2200), MCF-7 (catalog no. sc-2206), CaCo2 (catalog no. sc-2262) and SkBR3 (catalog no. sc-2218) cell extracts were purchased from SantaCruz Biotechnology.

Equal protein amounts were analyzed by SDS-PAGE and transferred to Nitrocellulose membrane as described above. The membrane was blocked with TTBS (Biolab, Cat #: 20892323)/10% skim milk (Difco, Cat #232100) and incubated with anti LSR antibodies (Abcam, cat #ab59646) diluted in TTBS/5% BSA (Sigma-Aldrich, A4503) at the indicated concentrations (Table 9), for 16 hours at 4° C. After 3 washes with in TTBS, The membrane was further incubated for 1 hour at Room Temperature with the secondary-conjugated antibodies as indicated (Table 9), diluted in TTBS. Chemiluminescence reaction was performed with ECL Western Blotting Detection Reagents (GE Healthcare, Cat #RPN2209) and the membrane was exposed to Super RX Fuji X-Ray film (Catalog no. 4741008389).

FIG. 20 demonstrates the endogenous expression of LSR in various cell lines. A band at 72 kDa corresponding to LSR was detected with anti LSR antibody in extracts of SK-OV3, Caov3, OVCAR3, OV-90, Hep G2, HeLa, CaCo2, and SkBR3 (FIG. 20A). Anti GAPDH (Abcam cat #ab9484) served as a loading control (FIG. 20B).

TABLE 9 Primary and secondary antibodies Antibody Application Dilution Mouse Anti FLAG-Cy3 (Sigma catalog number: IF 1:200  A9594) Mouse Anti FLAG-HRP (Sigma Catalog no. WB 1:2000 A8592) Rabbit Anti LSR (Abcam catalog number: IF 1:500  ab59646) WB 1:4000 Rabbit Anti LSR (Sigma catalog number: IF 1:100  HPA007270) WB 1:2500 Mouse Anti LSR (Abnova catalog number: IF 1:500  H00051599-B01P) WB 1:1000 Mouse Anti GAPDH (Abcam catalog number: WB 1:1000 ab9484) Donkey Anti Rabbit Cy3 (Jackson IF 1:200  ImmunoResearch Laboratories Inc. catalog no. 711- 165-152) Donkey Anti Mouse Dylight 549 (Jackson IF 1:100  ImmunoResearch Laboratories Inc. catalog no. 715- 506-150) Peroxidase conjugated affinity purified Goat Anti WB 1:10000 Rabbit IgG (Jackson ImmunoResearch Laboratories Inc. catalog no. 111-035-003) Peroxidase conjugated affinity purified Goat Anti- WB 1:10000 Mouse IgG (Jackson ImmunoResearch Laboratories Inc. catalog no. 115-035-146)

Example 15

Expression of TMEM25_Transcripts which are Detectable by Amplicon as Depicted in Sequence Name TMEM25_seg21-27 in Normal and Cancerous Breast Tissues

Expression of TMEM25 transcripts detectable by or according to seg21-27-TMEM25_seg_21-27_200-344/346_Amplicon (SEQ ID NO: 123) and primers TMEM25_seg21F_200-344 (SEQ ID NO. 124) and TMEM25_seg27R_200-346 (SEQ ID NO. 125) was measured by real time PCR. In parallel the expression of several housekeeping genes—G6PD (GenBank Accession No. NM_000402; (SEQ ID NO. 111) G6PD_Amplicon (SEQ ID NO. 114)), RPL19 (GenBank Accession No. NM_000981; (SEQ ID NO. 119)—RPL19 Amplicon (SEQ ID NO. 122)), PBGD (GenBank Accession No. BC019323; (SEQ ID NO. 115) PBGD_Amplicon (SEQ ID NO. 118)) and SDHA (GenBank Accession No. NM_004168; (SEQ ID NO. 103) SDHA_Amplicon (SEQ ID NO. 106)) was measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the normal samples (sample numbers 43, 45, 46, 47, 48, 49, 50, 51, 52, 54, 56, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68 and 69, Table 1 above), to obtain a value of fold differential expression for each sample relative to median of the normal samples.

In two experiments that were carried out no differential expression in the cancerous samples relative to the normal samples was observed (FIG. 21).

Primer pairs are also optionally and preferably encompassed within the present invention; for example, for the above experiment, the following primer pair was used as a non-limiting illustrative example only of a suitable primer pair: TMEM25_seg21F_200-344 (SEQ ID NO. 124) forward primer; and TMEM25_seg27R_200-346 (SEQ ID NO. 125) reverse primer.

The present invention also preferably encompasses any amplicon obtained through the use of any suitable primer pair; for example, for the above experiment, the following amplicon was obtained as a non-limiting illustrative example only of a suitable amplicon: TMEM25_seg_21-27_200-344/346_Amplicon (SEQ ID NO: 123).

Example 16

Expression of TMEM25 Transcripts which are Detectable by Amplicon as Depicted in Sequence Name TMEM25_seg21-27 in Different Normal Tissues

Expression of TMEM25 transcripts detectable by or according to seg21-27-TMEM25_seg_21-27_200-344/346_Amplicon (SEQ ID NO: 123) and primers TMEM25_seg21F_200-344 (SEQ ID NO. 124) and TMEM25_seg27R_200-346 (SEQ ID NO. 125) was measured by real time PCR. In parallel the expression of several housekeeping genes—SDHA (GenBank Accession No. NM_004168; (SEQ ID NO. 103) SDHA_Amplicon (SEQ ID NO. 106)), G6PD (GenBank Accession No. NM_000402; (SEQ ID NO. 111) G6PD_Amplicon (SEQ ID NO. 114)) and HPRT1 (GenBank Accession No. NM_000194; (SEQ ID NO. 107) HPRT1_Amplicon (SEQ ID NO. 110)) were measured similarly. For each RT sample, the expression of the above amplicon was normalized to the normalization factor calculated from the expression of these house keeping genes as described in normalization method 2 in the “materials and methods” section. The normalized quantity of each RT sample was then divided by the median of the quantities of the Breast samples (sample numbers 30, 31, 32 and 33, Table 2 above), to obtain a value of relative expression of each sample relative to median of the Breast samples (FIG. 22).

Example 17 Cloning of TMEM25 Proteins Cloning of TMEM25_T0_P5 ORF Fused to Flag TAG

Cloning of TMEM25_T0_P5 open reading frame (ORF) (SEQ ID NO: 130) fused to FLAG (SEQ ID NO: 153) was carried out by RT PCR as described below.

1 μl of undiluted Colon cancer pool DNA served as a template for a PCR reaction. The PCR was done using KAPA Hifi DNA polymerase (KAPABIOSYSTEM, Catalog no. KK2101) under the following conditions: 1 μl—cDNA described above; 1 μl (25 μM)—of each primer 200-374 TMEM25_NheI_Kozak seg5F (SEQ ID NO: 127) and 200-375_TMEM25_Flag_STOP_EcoRI_seg43R (SEQ ID NO: 128) in a total reaction volume of 50 ul; with a reaction program of 5 minutes in 95° C.; 40 cycles of: 20 seconds at 98° C., 15 seconds at 55° C., 1 minute at 72° C.; then 5 minutes at 72° C. Primers which were used include gene specific sequences; restriction enzyme sites; Kozak sequence and FLAG tag.

25 μl of PCR product were loaded onto a 1.5% agarose gel stained with ethidium bromide, electrophoresed in 1×TAE solution at 100V, and visualized with UV light. After verification of expected band size. 1 μl of the PCR product above template were served as a template for reamplification. The PCR was done using KAPA Hifi DNA polymerase (KAPABIOSYSTEM, Catalog no. KK2101) under the same conditions described above.

PCR product was purified from gel using QIAquick™ Gel Extraction kit (Qiagen, catalog number: 28707).

The purified PCR product was digested with NheI and EcoRI restriction enzymes (New England Biolabs, Beverly, Mass., U.S.A.). The digested DNA was then ligated into pIRESpuro3 (pRp) vector (Clontech, cat No: 631619) previously digested with the above restriction enzymes, using T4 DNA ligase (Promega, catalog number: M1801). The resulting DNA was transformed into competent E. coli bacteria DH5α (RBC Bioscience, Taipei, Taiwan, catalog number: RH816) according to manufacturer's instructions, then plated on LB-ampicillin agar plates for selection of recombinant plasmids, and incubated overnight at 3TC. The following day, positive colonies were screened by PCR using pIRESpuro3 vector specific primer and gene specific primer (data not shown). The PCR product was analyzed using 2% agarose gel as described above. After verification of expected band size, positive colonies were grown in 5 ml Terrific Broth supplemented with 100 μg/ml ampicillin, with shaking overnight at 37° C. Plasmid DNA was isolated from bacterial cultures using Qiaprep™ Spin Miniprep Kit (Qiagen, catalog number: 27106). Accurate cloning was verified by sequencing the inserts (Hylabs, Rehovot, Israel). Upon verification of an error-free colony (i.e. no mutations within the ORF), recombinant plasmids were processed for further analyses.

Cloning of TMEM25_T0_P5 ORF Non Tagged

Cloning of TMEM25_T0_P5 open reading frame (ORF) non tagged (SEQ ID NO: 130) was carried out by RT PCR as described below.

1 μl of undiluted Colon cancer pool DNA served as a template for a PCR reaction. The PCR was done using KAPA Hifi DNA polymerase (KAPABIOSYSTEM, Catalog no. KK2101) under the following conditions: 1 μl—cDNA described above; 1 μl (25 μM)—of each primer 200-374 TMEM25_NheI_Kozak seg5F (SEQ ID NO: 127) and 200-377_TMEM25_STOP_EcoRI_seg43R (SEQ ID NO: 131) in a total reaction volume of 50 μl; with a reaction program of 5 minutes in 95° C.; 40 cycles of: 20 seconds at 98° C., 15 seconds at 55° C., 1 minute at 72° C.; then 5 minutes at 72° C. Primers which were used include gene specific sequences; restriction enzyme sites and Kozak sequence.

25 μl of PCR product were loaded onto a 1.5% agarose gel stained with ethidium bromide, electrophoresed in 1×TAE solution at 100V, and visualized with UV light. After verification of expected band size. 5 μl of the PCR product above template were served as a template for reamplification. The PCR was done using KAPA Hifi DNA polymerase (KAPABIOSYSTEM, Catalog no. KK2101) under the same conditions described above.

PCR product was purified from gel using QIAquick™ Gel Extraction kit (Qiagen, catalog number: 28707).

The purified PCR product was digested with NheI and EcoRI restriction enzymes (New England Biolabs, Beverly, Mass., U.S.A.). The digested DNA was then ligated into pIRESpuro3 (pRp) vector (Clontech, cat No: 631619) previously digested with the above restriction enzymes, using T4 DNA ligase (Promega, catalog number: M1801). The resulting DNA was transformed into competent E. coli bacteria DH5α (RBC Bioscience, Taipei, Taiwan, catalog number: RH816) according to manufacturer's instructions, then plated on LB-ampicillin agar plates for selection of recombinant plasmids, and incubated overnight at 3TC. The following day, positive colonies were screened by PCR using pIRESpuro3 vector specific primer and gene specific primer (data not shown). The PCR product was analyzed using 2% agarose gel as described above. After verification of expected band size, positive colonies were grown in 5 ml Terrific Broth supplemented with 100 μg/ml ampicillin, with shaking overnight at 37° C. Plasmid DNA was isolated from bacterial cultures using Qiaprep™ Spin Miniprep Kit (Qiagen, catalog number: 27106). Accurate cloning was verified by sequencing the inserts (Hylabs, Rehovot, Israel). Upon verification of an error-free colony (i.e. no mutations within the ORF), recombinant plasmids were processed for further analyses.

Example 18 Generation of Stable Pool Expressing TMEM25_P5 and TMEM25_P5_Flag Proteins

The TMEM25_T0_P5 (SEQ ID NO: 130) and TMEM25_T0_P5_FLAG (SEQ ID NO: 126) pIRESpuro3 constructs or pIRESpuro3 empty vector were stably transfected into HEK-293T cells as follows:

HEK-293T (ATCC, CRL-11268) cells were plated in a sterile 6 well plate suitable for tissue culture, using 2 ml pre-warmed of complete media, DMEM [Dulbecco's modified Eagle's Media, Biological Industries (Beit Ha'Emek, Israel, catalog number: 01-055-1A)+10% FBS [Fetal Bovine Serum, Biological Industries (Beit Ha'Emek, Israel, catalog number: 04-001-1A)+4 mM L-Glutamine (Biological Industries (Beit Ha'Emek, Israel), catalog number: 03-020-1A). 350,000 cells per well were transfected with 2 μg of DNA construct using 6 μl FuGENE 6 reagent (Roche, catalog number: 11-814-443-001) diluted into 94 ul DMEM. The mixture was incubated at room temperature for 15 minutes. The complex mixture was added dropwise to the cells and swirled. Cells were placed in incubator maintained at 37° C. with 5% CO2 content. 48 hours following transfection, transfected cells were transferred to a 75 cm2 tissue culture flask containing 15 ml of selection media: complete media supplemented with 5 μg\ml puromycin (Sigma, catalog number P8833). Cells were placed in incubator, and media was changed every 3-4 days, until clone formation observed.

Upon sufficient quantities of cells passing through selection, 3-5 million cells were harvested. Cells were lysed in 300 μl RIPA buffer (50 mM Tris HCl pH 8, 150 mM NaCl, 1% NP-40, 0.5% sodium Deoxycholate, 0.1% SDS) supplemented with protease inhibitors (Roche, catalog number: 11873580001), for 20 min at 4° C. Following centrifugation at 4° C. for 10 minutes at 14,000×rpm, the clear supernatants were transferred to clean tubes, and were used for WB procedure: 30 ug of lysate was mixed with DTT 1,4-Dithiothreitol (DTT; a reducing agent) to a final concentration of 100 mM.

In addition, the samples were then incubated at 100° C. for 10 minutes, followed by a 1 minute spin at 14,000×rpm. SDS-PAGE (Laemmli, U.K., Nature 1970; 227; 680-685) was performed upon loading of 30 μl of sample per lane into a 4-12% NuPAGE® Bis-Tris gels (Invitrogen, catalog number: NP0321), and gels were run in 1×MES SDS running buffer (Invitrogen, catalog number: NP0060), using the XCell SureLock™ Mini-Cell (Invitrogen, catalog number: E10001), according to manufacturer's instructions. The separated proteins were transferred to a nitrocellulose membrane (Schleicher & Schuell, catalog number: 401385) using the XCell™ II blotting apparatus (Invitrogen, catalog number E19051), according to manufacturer's instructions.

The membrane containing blotted proteins was processed for antibody detection as follows:

Non-specific regions of the membrane were blocked by incubation in 5% skim-milk diluted in Phosphate buffered saline (PBS) supplemented with 0.05% Tween-20 (PBST) for 1 hour at room temperature (all subsequent incubations occur for 1 hour at room temperature). Blocking solution was then replaced with primary Rabbit Anti TMEM25 antibody (Cat no. HPA012163, Sigma) diluted 1:500 in 5% bovine serum albumin (BSA) (Sigma, catalog number: A4503) (diluted in PBS). After 1 hour incubation, Three 5 minute washes, secondary antibody was applied: goat anti-rabbit conjugated to Peroxidase conjugated Affipure Goat anti Rabbit IgG (Jackson, catalog number: 111-035-003) diluted 1:20,000 in blocking solution. Proteins were also detected by Mouse anti Flag M2-Peroxidase (Sigma, catalog number: A8592) diluted 1:1000 in blocking solution. After 1 hour incubation, 3×5 minute washes, ECL substrate (PIERCE, catalog number: PIR-34080) was applied for 1 minute, followed by exposure to X-ray film (Fuji, catalog number: 100NIF). The results are presented in FIG. 23.

FIG. 23A demonstrate that Rabbit anti TMEM25 described above recognized specifically TMEM25_P5 protein (SEQ ID NO: 7) and TMEM25_P5_Flag (SEQ ID NO: 129) at the expected band size˜40.2 kDa, but not HEK_293_TpRp3.

FIG. 23B demonstrate that TMEM25_P5_Flag proteins (SEQ ID NO: 129) were specifically recognized by anti-Flag at the expected band size˜40.2 kDa.

Example 19 Determination of the Subcellular Localization of the Ectopic TMEM25_P5 and TMEM25_P5_Flag in HEK293T Cells by Immunofluorescence

Protein localization of TMEM25_P5 (SEQ ID NO: 7) and of TMEM25_P5_FLAG (SEQ ID NO: 129) were observed upon Stable transfection as described above using confocal microscopy.

Stably transfected recombinant HEK293T cells expressing TMEM25_P5 (SEQ ID NO: 7) and TMEM25_P5_FLAG (SEQ ID NO: 129) were plated on coverslips pre-coated with Poly-L-Lysine (Sigma; Catalogue no. P4832). After 24 hrs the cells were processed for immunostaining and analyzed by confocal microscopy.

The cover slip was washed in phosphate buffered saline (PBS), then fixed for 15 minutes with a solution of 3.7% paraformaldehyde (PFA) (Sigma, catalog number: P-6148)/3% glucose (Sigma, catalog number: G5767) (diluted in PBS). Quenching of PFA was done by a 5 minute incubation in 3 mM glycine (Sigma, catalog number: G7126) (diluted in PBS). After two 5-minute washes in PBS, blocking of non-specific regions was done with 5% bovine serum albumin (BSA) (Sigma, catalog number: A4503) (diluted in PBS) for 20 minutes.

The coverslip was then incubated, in a humid chamber for 1 hour, with mouse anti FLAG-Cy3 antibodies (Sigma, catalog number: A9594), diluted 1:200 in 5% BSA in PBS, OR with Rabbit Anti TMEM25 (Cat no. HPA012163, Sigma), diluted 1:50 in 5% BSA in PBS followed by three 5-minute washes in PBS. For the anti TMEM25 Ab only, a secondary Ab was needed: Donkey anti Rabbit cy3 (cat #711-165-152, Jackson) diluted 1:200 in 5% BSA in PBS, incubated in a humid chamber for 1 hour, followed by three 5-minute washes in PBS. After a prewash with BISBENZIMIDE H 33258 (HBSS) (Sigma, catalog number: 14530), the coverslip was incubated with WGA-Alexa 488 (Invitrogen, catalog number W11261) diluted 1:200 in HBSS for 10 min, followed by two washes in HBSS and incubated in BISBENZIMIDE H 33258 (Sigma, catalog number: 14530) diluted 1:1000 in HBSS. The coverslip was then mounted on a slide with Gel Mount Aqueous medium (Sigma, catalog number: G0918) and cells were observed for the presence of fluorescent product using confocal microscopy.

The subcellular localization of TMEM25_P5 (SEQ ID NO:132) and TMEM25_P5_Flag (SEQ ID NO: 129) using anti TMEM25 Abs, is demonstrated in FIGS. 24A and 24B respectively. FIG. 24C demonstrates TMEM25_P5_Flag (SEQ ID NO: 129) localization using anti-FLAG Abs (Sigma, catalog number: A9594). TMEM25_P5 protein is localized to the cell surface.

Example 20 Determining Cell Localization of TMEM25_P5_Flag by FACS

Membrane localization of TMEM25_P5_Flag protein (SEQ ID NO: 129) was observed upon stable transfection described above, by Flow cytometry analysis, using anti TMEM25 antibodies (Ab1628, Yomics) and by Normal mouse serum as negative control (015-000-120, Jackson). Recombinant HEK293T cells expressing TMEM25_P5_Flag were stained with anti TMEM25 antibodies (A) or by Normal mouse serum (B) followed by Donkey Anti Mouse-DyLight 549 conjugated secondary Ab (Jackson 715-506-150), and were observed for the presence of fluorescent signal.

Recombinant HEK293T-TMEM25_P5_Flag cells were dissociated from the plate using Cell dissociation buffer Enzyme-Free PBS-Based (Gibco; 13151-014), washed in FACS buffer [Dulbecco's Phosphate Buffered Saline (PBS) (Biological Industries, 02*023-1A)/1% Bovine Albumin (Sigma, A7030)] and counted. 0.5×10{circumflex over ( )}6 cells were re-suspended in 100 μl of antibody solution, at a dilution 1:2250 ul, and incubated for 1 hour on ice. The cells were washed with ice-cold FACS buffer and incubated with secondary antibody as indicated for 1 hour on ice. The cells were washed with ice-cold FACS buffer and re-suspended in 500 μl FACS buffer, then analyzed on the FACS machine (FACSCalibur, BD). The data was acquired and analyzed using Cellquest Pro VER. 5.2.

The results presented in FIG. 25 demonstrate that anti TMEM25 antibodies (A) bind to the full length TMEM25 protein, in HEK293T recombinant cells expressing TMEM25_P5_Flag protein, as compare to mouse serum (B) used as a negative control, indicating membrane localization of TMEM25 protein.

Example 21 Analysis of the Expression of Endogenous TMEM25 Protein in Various Cell Lines

The expression of endogenous TMEM25 protein in various cell lines was analyzed by Western Blotting as described below.

JURKAT (ATCC no. TIB-152), Daudi (ATCC no. CCL-213), RPMI8226 (ATCC no. CCL-155), G-361 (ATCC no. CRL-1424), KARPAS (ATCC no. VR-702) cell extracts were prepared as described above (Lanes 3-7 in FIG. 26—see figure legend for the corresponding lane/material assignments).

Whole cell lysates were prepared and analyzed by western blot as described above. Equal protein amounts were analyzed by SDS-PAGE and transferred to Nitrocellulose membrane as described above.

The membrane was blocked by 5% skim-milk diluted in Phosphate buffered saline (PBS) supplemented with 0.05% Tween-20 (PBST) for 1 hour incubation at room temperature (all subsequent incubations occur for 1 hour at room temperature). Blocking solution was then replaced with primary Rabbit Anti TMEM25 antibody (Cat no. HPA012163, Sigma) diluted 1:500 in 5% bovine serum albumin (BSA) (Sigma, catalog number: A4503) (diluted in PBS). After 1 hour incubation, Three 5 minute washes, secondary antibody was applied: goat anti-rabbit conjugated to Peroxidase conjugated Affipure Goat anti Rabbit IgG (Jackson, catalog number: 111-035-003) diluted 1:20,000 in blocking solution. Proteins were also detected by Mouse anti Flag M2-Peroxidase (Sigma, catalog number: A8592) diluted 1:1000 in blocking solution. After 1 hour incubation, 3×5 minute washes, ECL substrate (PIERCE, catalog number: PIR-34080) was applied for 1 minute, followed by exposure to X-ray film (Fuji, catalog number: 100NIF).

FIG. 26 demonstrates the endogenous expression of TMEM25 in various cell lines. A protein at 40.2 kDa corresponding to TMEM25 as observed in HEK293T cells expressing TMEM25_P5_Flag (lane 2; lane 1 shows a control without Flag), detected with anti TMEM25 antibody in extracts of RPMI8226 (lane 5), Daudi (lane 6) and JURKAT (lane 7).

Example 22

Transfection of Stable HEK293T_TMEM25 with siRNA to TMEM25

Specific knockdown of TMEM25_P5_Flag protein (SEQ ID NO:129) expression was observed in HEK293T cells stably expressing TMEM25_P5_Flag (SEQ ID NO 129) previously described upon transfection with TMEM25_P5-SiRNAs.

siRNA was purchased from Dharmacon as follows: TMEM25 (L-018183-00-0005, Dharmacon, ON TARGET plus SMART pool, Human TMEM25 (84866), 5 nmol) and scrambled SiRNA as a negative control (Dharmacon, D-001810-10-05).

Cells were plated at 50-70% confluence 24 hr prior to transfection. siRNA complexes at 250 pmol were added to 250 ul reduced serum Opti-MEM (cat 31985, GIBCO). In parallel, Lipofectamine 2000 reagent (cat #11668019, Invitrogen) was mixed; 5 ul was added to 250 ul reduced serum Opti-MEM (cat 31985, GIBCO). Tubes were combined and incubated for 15-30 min at RT for sufficient complexes to form; the material was then distributed over the cells and incubated for 48 hr. Cells were harvested and cell lysates prepared as described above and detected by anti TMEM25 (Cat no. HPA012163, Sigma), following by secondary Donkey anti Rabbit conjugated to Peroxidase.

FIG. 27 demonstrates specific knockdown of TMEM25_P5_Flag protein (SEQ ID NO: 129) in HEK293T cells stably expressing TMEM25_P5_Flag (SEQ ID NO 129) transfected with TMEM25_P5 siRNA (L-018183-00-0005, Dharmacon) (Lane 2) compared to HEK293T cells stably expressing TMEM25_P5_FLAG transfected with Scrambled-SiRNA (Lane 1) (Dharmacon, D-001810-10-05), using anti TMEM25 antibodies (Sigma, cat #HPA012163).

Example 23 Immunohistochemistry (IHC) Using Anti LSR and Anti TMEM25 Poly Clonal Antibodies

To assess the tissue binding profiles, anti-LSR (Abcam catalog number: ab59646) and Anti TMEM25 (Cat no. HPA012163, Sigma), were applied on a panel of tumor tissues microarray (TMA), as detailed in Table 10.

HEK-293 cells expressing LSR_P5a_Flag_m (SEQ ID NO 144) or TMEM25_P5_Flag (SEQ ID NO:129) were used as a positive control for calibration of the pAb for staining. HEK293T cells transfected with empty vector were used as a negative controls as well as rabbit serum IgG antibodies.

The immunohistochemical detection of LSR_P5a_Flag_m (SEQ ID NO:144) or with TMEM25_P5_Flag (SEQ ID NO:129) by the antibodies anti-LSR and Anti TMEM25 accordingly, were calibrated in formalin-Fixed paraffin-embedded (FFPE) sections. Two antigen retrieval methods were used: pH6.1 and pH9.0 in three Abs concentrations (3.1, 0.3 ug/ml).

The antigen retrieval methods were performed as follows. The above described FFPE sections were deparaffinized, antigen retrieved and rehydrated using pH6.1 or pH9.0 Flex+3-in-1 antigen retrieval buffers and a PT Link automated antigen retrieval system, at 95° C. for 20 min with automatic heating and cooling.

Following antigen retrieval, sections were washed in distilled water for 2×5 min then loaded into a DAKO Autostainer Plus. The sections were then incubated for 10 min with Flex+ Peroxidase Blocking reagent, rinsed twice in 50 mM Tris.HCl, 300 mM NaCl, 0.1% Tween-20, pH 7.6 (TBST), followed by a 10 min incubation with Protein Block reagent (DAKO X0909).

The sections were incubated for 30 min with primary antibody diluted in DAKO Envision Flex antibody diluent (DAKO Cytomation, Cat #K8006). Following incubation with primary antibodies, the sections were then rinsed twice in FLEX buffer, incubated with anti-mouse/rabbit Flex+ HRP for 20 min, rinsed twice in FLEX buffer and then incubated with diaminobenzidine (DAB) substrate for 10 min. The chromagenic reaction was stopped by rinsing the slides with distilled water.

Following chromagenesis, the sections were counterstained with haematoxylin, dehydrated in an ascending series of ethanols (90-99-100%), cleared in three changes of xylene and coverslipped under DePeX. Stained sections were analysed by using an Olympus BX51 microscope with a Leica DFC290 camera.

FIG. 28 demonstrates that anti LSR antibody (Cat no. ab59646, Abcam) in sections of positive control cell line (panels A, C and E) showed specific immunoreactivity in a dose dependent concentrations of 3.1 and 0.3 ug/ml respectively, as compared to the negative control cell line (panels B, D and F), in pH 9, according to the antigen retrieval method previously described.

FIG. 29 demonstrates that anti TMEM25 (Cat no. HPA012163, Sigma) in sections of positive control cell line (panels A, C and E) shows specific immunoreactivity in a dose dependent concentrations of 3.1 and 0.3 ug/ml respectively, as compared to the negative control cell line (panels B, D and F), in pH 9, according to the antigen retrieval method previously described.

TABLE 10 Summary of the tissue samples included in the tissue microarray (TMA). TMA Map (X, Y) Donor ID position ID Tissue Path report Age Sex 1 (1, 1) 15766 tumour:breast:lobular carcinoma Infiltrating lobular carcinoma. 42 Female Grade2/3 2 (2, 1) 5252 tumour:breast:ductal- This slide contains a sample of an 57 Female adenocarcinoma in situ and infiltrating ductal carcinoma (modified Bloom and Richardson grade III). Breast-in situ and infiltrating ductal carcinoma. 3 (3, 1) 8723 tumour:breast:ductal- Primary breast cancer (invasive 74 Female adenocarcinoma ductal pattern) 4 (4, 1) 15778 tumour:breast:lobular carcinoma Sections of skin with dermis and 52 Female subcutis infiltrated by poorly differentiated, slightly discohesive carcinoma. Individual cells have rather pleomorphic nuclei. Appearances are consistent with a pleomorphic lobular carcinoma. 5 (5, 1) 3724 tumour:breast:ductal- Invasive and in situ ductal 82 Female adenocarcinoma carcinoma of breast. 6 (6, 1) 2953 tumour:breast:ductal- The specimen consists of breast 67 Female adenocarcinoma tissue including DCIS (ductal carcinoma in situ) and widespread invasive poorly differentiated adenocarcinoma. 7 (7, 1) 9533 tumour:breast:ductal- This slide contains breast tissues 50 Female adenocarcinoma infiltrated by a poorly differentiated ductal carcinoma. Breast tumour-ductal carcinoma. 8 (8, 1) 3346 tumour:breast:ductal- The specimen consists of 63 Female adenocarcinoma connective tissue elements widely infiltrated by a poorly differentiated ductal adenocarcinoma. 9 (9, 1) 5704 breast This section contains a good 46 Female sample of normal breast tissue 10 (10, 1) 5347 breast Normal breast 64 Female 11 (11, 1) 3550 tumour:colon:adenocarcinoma The large bowel is widely 61 Male infiltrated by a moderately well differentiated adenocarcinoma consistent with a derivation from the colon. 12 (12, 1) 3269 tumour:colon:adenocarcinoma Primary colonic pattern 58 Male adenocarcinoma (moderately differentiated). 13 (1, 2) 15767 tumour:colon:adenocarcinoma Moderately differentiated 58 Female adenocarcinoma. 14 (2, 2) 3751 tumour:colon:adenocarcinoma Moderately differentiated 79 Female adenocarcinoma. 15 (3, 2) 3881 tumour:colon:adenocarcinoma Moderately differentiated 71 Male adenocarcinoma. 16 (4, 2) 2889 tumour:colon:adenocarcinoma The specimen consists of large 73 Female bowel showing surface ulceration associated with a moderately well differentiated primary adenocarcinoma. 17 (5, 2) 15764 tumour:colon:adenocarcinoma Moderately differentiated 75 Female adenocarcinoma. 18 (6, 2) 15763 tumour:colon:adenocarcinoma Moderately differentiated 69 Female adenocarcinoma. 19 (7, 2) 2681 colon Normal colon: full thickness. 54 Female 20 (8, 2) 3121 colon Full thickness normal colon. 34 Male Colon-normal. 21 (9, 2) 5638 tumour:prostate Prostate tumour- 87 Male adenocarcinoma consistent with an origin in prostate. Gleason score 5 + 5 = 10. 22 (10, 2) 15295 tumour:prostate:adenocarcinoma Adenocarcinoma. Gleason Score 71 Male 3 + 3 = 6 23 (11, 2) 15301 tumour:prostate:adenocarcinoma Adenocarcinoma. Gleason Score 51 Male 3 + 4 = 7 24 (12, 2) 15758 tumour:prostate:adenocarcinoma Adenocarcinoma. Gleason Score 74 Male 3 + 4 = 7 25 (1, 3) 15745 tumour:prostate:adenocarcinoma Adenocarcinoma. Gleason Score 52 Male 4 + 5 = 9 26 (2, 3) 15777 tumour:prostate:adenocarcinoma Adenocarcinoma. Gleason Score 68 Male 4 + 4 = 8 27 (3, 3) 15755 tumour:prostate:adenocarcinoma Adenocarcinoma. Gleason Score 55 Male 3 + 4 = 7 28 (4, 3) 15756 tumour:prostate:adenocarcinoma Adenocarcinoma. Gleason Score 68 Male 4 + 5 = 9 29 (5, 3) 1317 prostate Normal prostate 55 Male 30 (6, 3) 13951 prostate Normal prostate 37 Male 31 (7, 3) 15052 Lymphoma Lymph node infiltrated by large 45 Female cell lymphoma 32 (8, 3) 15760 Lymphoma Low Grade Non-Hodgkin's 72 Female Lymphoma 33 (9, 3) 15754 Lymphoma High Grade Non-Hodgkin's 77 Male Lymphoma 34 (10, 3) 15039 Lymphoma Infiltrate of medium to large 47 Male size lymphocytes with high mitotic rates. High grade Non- Hodgkin's Lymphoma. 35 (11, 3) 15034 Lymphoma Diffuse infiltrate of monotamous 71 Male lymphoid cells consistent with Non-Hodgkin's Lymphoma. 36 (12, 3) 15037 Lymphoma Diffuse infiltrate of 53 Female monotamous lymphoid cells consistent with Non-Hodgkin's Lymphoma. Thyroid tissue seen on edge of section. 37 (1, 4) 15032 Lymphoma Diffuse infiltrate of small 50 Female lymphocytes consistent with Non-Hodgkin's Lymphoma. 38 (2, 4) 15775 Lymphoma Hodgkin's Lymphoma 75 Female 39 (3, 4) 4655 lymph-node Lymph node within normal limits. 1 Female 40 (4, 4) 10789 lymph-node Normal lymph node. 58 Male 41 (5, 4) 12053 tumour:lung Poorly differentiated non- 72 Male small cell carcinoma with some squamoid features. NON SMALL CELL CARCINOMA 42 (6, 4) 15772 tumour:lung:non-small cell Poorly differentiated non-small 44 Male carcinoma cell carcinoma 43 (7, 4) 13586 tumour:lung Moderately to poorly differentiated 67 Female squamous carcinoma. 44 (8, 4) 2760 tumour:lung:squamous-cell- The specimen includes normal 64 Male carcinoma bronchus, a large vessel presumed to be an artery showing extensive intimal fibrosis/organisation as well as lung parenchyma widely infiltrated by a moderately well differentiated keratinising squamous cell carcinoma. 45 (9, 4) 9354 tumour:lung:adenocarcinoma Section of lung tissue 63 Male containing a tumour growing along the alveolar spaces. The tumour is of large cell type showing features of an adenocarcinoma. 46 (10, 4) 3473 tumour:lung:adenocarcinoma Lung tumour-poorly 72 Male differentiated adenocarcinoma consistent with a primary origin in lung if an origin elsewhere can be excluded. 47 (11, 4) 5757 tumour:lung:adenocarcinoma Lung tumour-adenocarcinoma of 72 Male broncho-alveolar pattern. 48 (12, 4) 4852 tumour:lung:adenocarcinoma Lung tumour-adenocarcinoma 56 Female with prominent broncho-alveolar pattern. 49 (1, 5) 10414 small cell Sections of lung showing a 74 Male poorly differentiated, small cell carcinoma. DIAGNOSIS: Lung; small cell carcinoma. 50 (2, 5) 15055 small cell Fibrous tissue infiltrated by small 52 Male cell carcinoma 51 (3, 5) 15054 small cell Sections of lung infiltrated by 65 Male small cell carcinoma 52 (4, 5) 15053 small cell Sections of lung infiltrated by 52 Male small cell carcinoma 53 (5, 5) 1311 lung:parenchyma Lung within normal limits. 36 Female 54 (6, 5) 14 lung:parenchyma Normal lung and bronchus. 39 Female 55 (7, 5) 5767 lung:parenchyma Lung parenchyma (including 45 Male pleural surface)-normal limits. 56 (8, 5) 2649 lung:parenchyma Normal lung 37 Male 57 (9, 5) 3588 tumour:stomach Biopsy shows poorly differentiated 69 Female mucinous carcinoma. 58 (10, 5) 5065 tumour:stomach Sections show a well 64 Male differentiated adenocarcinoma of the stomach. 59 (11, 5) 9275 tumour:stomach Sections of stomach antrum 78 Female showing a moderately differentiated, infiltrating adenocarcinoma. The carcinoma is seen in both the mucosa and infiltrating the submucosa. DIAGNOSIS: gastric carcinoma. 60 (12, 5) 2295 stomach Section shows a moderately 66 Female differentiated adenocarcinoma of the stomach. 61 (1, 6) 13665 stomach:body Full thickness section of normal 57 Female stomach compatible with body. 62 (2, 6) 2874 stomach:body Stomach-full thickness wall with 53 Male normal body type mucosa. 63 (3, 6) 12998 tumour:ovary A serous papillary cystic 78 Female carcinoma. 64 (4, 6) 13003 tumour:ovary Invasive serous papillary 74 Female carcinoma. 65 (5, 6) 5739 tumour:ovary Sections of ovary showing 48 Female infiltrating islands of cohesive cells in which there are nuclei showing nuclear grooving. The appearances are consistent with a granulosa cell tumour, ovary; granulosa cell tumour. 66 (6, 6) 9407 tumour:ovary This slide contains a portion 75 Female from the wall of a multi loculated ovarian tumour with a pattern best classified as serous cystadenocarcinoma. Ovary tumour-serous cystadenocarcinoma. 67 (7, 6) 4739 ovary This is normal ovarian tissue 42 Female showing follicular structures (primordial follicles and a cystic follicle) and an involuting corpus luteum. 68 (8, 6) 4781 ovary Normal ovarian cortex with 34 Female follicles. 69 (9, 6) 15759 melanoma Malignant melanoma 65 Male 70 (10, 6) 15753 melanoma High grade malignant melanoma 46 Female 71 (11, 6) 15038 melanoma Sections of skin with ulcerated 41 Male surface with a large dermal deposit of malignant melanoma 72 (12, 6) 15343 melanoma Malignant melanoma 24 Male 73 (1, 7) 13779 skin This slide contains a well 44 Female orientated section of normal skin including some subcutis. Hair follicles are few in number, sebaceous glands are few and sweat glands are moderately abundant. Skin, breast-normal. 74 (2, 7) 13280 skin Normal skin including dermis and 50 Female epidermis. 75 (3, 7) 15342 tumour:brain:glioblastoma Sections of brain of a very cellular 56 Male multiforme tumour composed of glial cells demonstrating nuclear pleiomorphism and focal necrosis 76 (4, 7) 9514 tumour:brain Sections shows brain tissue 17 Male infiltrated by an Astrocytoma; grade 2. 77 (5, 7) 3306 tumour:brain Sections show a spindle cell 82 Male meningioma. 78 (6, 7) 9516 tumour:brain Sections shows brain tissue 25 Female infiltrated by an Astrocytoma; grade 4. 79 (7, 7) 2007 brain:cortex:frontal Normal brain 40 Male 80 (8, 7) 4585 brain:cortex:frontal Sections show normal grey 85 Male matter of the cortex containing unremarkable neurones and this overlies normal white matter. normal brain cortex. 81 (9, 7) 3737 tumour:kidney The specimen shows the 54 Female features of a primary renal cell adenocarcinoma. 82 (10, 7) 13262 tumour:kidney Grade 1 papillary transitional cell 59 Male carcinoma 83 (11, 7) 4764 tumour:kidney Renal cell (clear cell) carcinoma 66 Male 84 (12, 7) 9043 tumour:kidney Clear cell renal cell carcinoma of 45 Male kidney. 85 (1, 8) 2874 kidney:cortex Normal renal cortex 53 Male 86 (2, 8) 4818 kidney:cortex Normal renal cortex. 52 Female 87 (3, 8) 14022 tumour:liver Poorly differentiated 45 Male cholangiocarcinoma 88 (4, 8) 15757 tumour:liver Fibrolamellar hepatocellular 25 Male carcinoma 89 (5, 8) 14826 tumour:liver Low Grade hepatocellular 66 Female carcinoma 90 (6, 8) 15750 tumour:liver Cholangiocarcinoma 70 Female 91 (7, 8) 1991 liver:parenchyma Normal liver 79 Female 92 (8, 8) 3123 liver:parenchyma Liver-normal limits. 31 Male

Example 24 Full Length Validation of Encoding LY6G6F Transcript

A full Length transcript encoding LY6G6F (SEQ ID NO: 1) was validated as described below:

1. A reverse transcription reaction was carried out as follows: 10 μg of purified RNA (lung normal) was mixed with 150 ng Random Hexamer primers (Invitrogen, Carlsbad, Calif., USA, catalog number: 48190-011) and 500 μM dNTPs in a total volume of 156 μl. The mixture was incubated for 5 min at 65° C. and then quickly chilled on ice. Thereafter, 50 μl of 5×SuperscriptII first strand buffer (Invitrogen, catalog number: 18064-014, part number: Y00146), 24 μl 0.1M DTT and 400 units RNasin (Promega, Milwaukee, WS, U.S.A., catalog number: N2511) were added, and the mixture was incubated for 10 min at 25° C., followed by further incubation at 42° C. for 2 min. Then, 10 μl (2000 units) of SuperscriptII (Invitrogen, catalog number: 18064-014) was added and the reaction (final volume of 250 μl) was incubated for 50 min at 42° C. and then inactivated at 70° C. for 15 min. The resulting cDNA was diluted 1:20 in TE buffer (10 mM Tris, 1 mM EDTA pH 8). 2. PCR was done using 2×GoTaq ReadyMix (Promega, catalog number: M7122.) under the following conditions: 12.5 ul GoTaq ready mix; 5 ul cDNA from the above; 1 ul of 10 uM forward primer 100-690 (SEQ ID NO:51); 1 ul of 10 uM reverse primer 100-691 (SEQ ID NO:52) and 5.5 ul H2O in a total reaction volume of 25 μl; with a reaction program of 5 minutes in 95° C.; 35 cycles of: 30 seconds at 94° C., 30 seconds at 53° C., 50 seconds at 72° C.; then 10 minutes at 72° C. The details regarding the primers are presented in Table 11 below.

The PCR product above was loaded on 1.2% agarose gel stained with ethidium bromide, electrophoresed in 1×TAE solution at 100V, and visualized with UV light. The expected band size was excised and extracted from the gel using QiaQuick™ Gel Extraction kit (Qiagen, catalog number: 28707). The purified DNA was then sequenced (Tel-Aviv University, Israel) using the above primers and was verified for the full length LY6G6F encoding transcript (SEQ ID NO:1).

Example 25 Cloning of Full Length Transcript Encoding LY6G6F Fused to EGFP

Cloning of Full Length transcript encoding LY6G6F fused to EGFP (Enhanced Green Fluorescent Protein) was performed as described below.

First, an EGFP expression vector was constructed and then the LY6G6F open reading frame (SEQ ID NO:57), encoding the amino acid sequence set forth in SEQ ID NO:58, was cloned. EGFP was subcloned into pIRESpuro3 (Clontech catalog number: 631619) as follows: EGFP-N1 vector (Clontech catalogue number: 6085-1) was digested with NheI and NotI to excise the EGFP gene. The EGFP insert was then ligated into pIRESpuro3 (Clontech catalogue number: 631619), which was previously digested with the same enzymes, in order to obtain the EGFP-pIRESpuro3 vector.

PCR was done using Platinum PFX™ (Invitrogen., Carlsbad, Calif., USA, catalog number: 1178-021) under the following conditions: 5 μl Platinum PFX 10× buffer; 2 μl—purified validated DNA from the above; 1 μl-10 mM dNTPs (2.5 mM of each nucleotide); 1 μl—Platinum PFX enzyme; 37 μl—H2O; 1 μl of 10 uM forward primer 100-729 (SEQ ID NO:53); 1 ul of 10 uM reverse primer 100-730 (SEQ ID NO:54) (10 μM each) in a total reaction volume of 50 μl; with a reaction program of 5 minutes in 95° C.; 35 cycles of: 30 seconds at 94° C., 30 seconds at 55° C., 60 seconds at 68° C.; then 10 minutes at 68° C. Primers which were used included gene specific sequences corresponding to the desired coordinates of the protein and restriction enzyme sites and Kozak sequence, as listed in Table 11, below and in FIG. 6. Bold letters in Table 11 represent the specific gene sequence while the restriction site extensions utilized for cloning purposes are in Italic and Kozak sequence are underlined.

5 μl of the PCR product above, were loaded on 1.2% agarose gel stained with ethidium bromide, electrophoresed in 1×TAE solution at 100V, and visualized with UV light. After verification of expected size band, remaining PCR product was processed for DNA purification using Qiaquick PCR purification kit (Qiagen™, Valencia, Calif., U.S.A., catalog number 28106). The extracted PCR product were digested with NheI and EcoRI restriction enzymes (New England Biolabs, Beverly, Mass., U.S.A.), as listed in Table 11. After digestion, DNAs were loaded onto a 1.2% agarose gel as described above. The expected band size was excised and extracted from the gel using QiaQuick™ Gel Extraction kit (Qiagen, catalog number: 28707).

The digested DNA was ligated to EGFP_pIRESpuro3 vector previously digested with NheI and EcoRI restriction enzymes, using the LigaFast™ Rapid DNA Ligation System (Promega, catalog number: M8221). The resulting DNA was transformed into competent E. coli bacteria DH5α (RBC Bioscience, Taipei, Taiwan, catalog number: RH816) according to manufacturer's instructions, then plated on LB-ampicillin agar plates for selection of recombinant plasmids, and incubated overnight at 3TC.

Screening positive clones was performed by PCR using GoTaq Ready Mix (Promega, catalog number: M7122). Positive colonies were grown in 5 ml Terrific Broth supplemented with 100 μg/ml ampicillin, with shaking overnight at 37° C. Plasmid DNA was isolated from bacterial cultures using Qiaprep™ Spin Miniprep Kit (Qiagen, catalog number: 27106). Accurate cloning was verified by sequencing the inserts (Tel Aviv University, Israel). Upon verification of an error-free colony (i.e. no mutations within the ORF), recombinant plasmids were processed for further analysis.

The DNA sequence of the resulting LY6G6F full length_fused to EGFP (SEQ ID NO:55) is shown in FIG. 7. In FIG. 7 gene specific sequence corresponding to the LY6G6F full length sequence is marked in bold faced type, while the EGFP sequence is marked in Italics and underlining. The amino acid sequence of the resulting LY6G6F full length fused to EGFP (SEQ ID NO:56) is shown in FIG. 8; gene specific sequence corresponding to the full length sequence of LY6G6F is marked in bold faced type, while the EGFP sequence is marked in Italics and underlining.

TABLE 11 primer details SEQ ID Primer Primer Restriction NO: ID sequence site 51 100-690 GAGAACTTGG — CAGGCTCTCC 52 100-691 CACACTTCCC — AGCAGATGTC 53 100-729 CTAGCTA GCCA NheI CCATTGGCAGT CTATTCCTCCT C 54 100-730 CGCGAATTC GC EcoRI CTGGGCTTGTG GGCAGGTG

Example 26 Determining Cell Localization of LY6G6F

In order to determine the cellular localization of the LY6G6F protein, LY6G6F-EGFP fusion protein (SEQ ID NO:56) was used. LY6G6F protein localization was observed upon transient transfection (Chen et al., Molecular vision 2002; 8; 372-388) using the confocal microscope. The cells were observed for the presence of fluorescent products 48 hours following transfection.

The LY6G6F-EGFP pIRESpuro3 construct, described above, was transiently transfected into HEK-293T cells as follows:

HEK-293T (ATCC, CRL-11268) cells were plated on sterile glass coverslips, 13 mm diameter (Marienfeld, catalog number: 01 115 30), which were placed in a 6 well plate, using 2 ml pre-warmed DMEM [Dulbecco's modified Eagle's Media, Biological Industries (Beit Ha'Emek, Israel), catalogue number: 01-055-1A]+10% FBS (Fetal Bovine Serum)+4 mM L-Glutamine. 500,000 cells per well were transfected with 2 μg of the DNA construct using 6 μl FuGENE 6 reagent (Roche, catalog number: 11-814-443-001) diluted into 94 ul DMEM. The mixture was incubated at room temperature for 15 minutes. The complex mixture was added dropwise to the cells and swirled. Cells were placed in an incubator maintained at 3TC with 5% CO2 content.

48 hours post transient transfection the cells were further processed for analysis in confocal microscopy. The cover slips were washed 3 times in phosphate buffered saline (PBS) and fixed for 15 minutes with 3.7% paraformaldehyde (PFA) (Sigma, catalog number: P-6148). After 2 washes in PBS, the fixed coverslips were glued to a slide using mounting solution (Sigma, catalog number: G0918) and cells were observed for the presence of fluorescent product using confocal microscope. The results are presented in FIG. 9.

FIG. 9 demonstrates that the LY6G6F EGFP (SEQ ID NO:56) fused protein localizes to cell membrane upon expression in HEK 293T cells. The image was obtained using the 40× objective of the confocal microscope.

Example 27 Cloning and Expression of the LY6G6F, VSIG10, TMEM25 and LSR ECD-Mouse IGg2A-FC Fused Proteins

Mouse orthologs of human LY6G6F, VSIG10, TMEM25, and LSR proteins were identified using BlastP software of the National Center of Biotechnology Information (NCBI) using default parameters and used to gain experimental proof of concept related to the functionality of the LY6G6F, VSIG10, TMEM25 and/or LSR Ig fusion proteins in animal model. The mouse orthologs corresponding to human LY6G6F, VSIG10, TMEM25 and LSR proteins are shown in SEQ ID NOs: 20, 19, 9 and 21, respectively. The amino acid alignment and comparison of the human LY6G6F, VSIG10, LSR and TMEM25 proteins to the respective mouse orthologs is shown in FIGS. 5A, 5B, 5C and 5D respectively.

cDNA sequence mouse TMEM25 (SEQ ID NO:9), LY6G6F (SEQ ID NO:20), VSIG10 (SEQ ID NO:19), and LSR (SEQ ID NO: 21) proteins were each fused to the Fc domain of mouse IgG2aFc (SEQ ID NO: 27). In all cases the natural corresponding signal peptide was used for each ECD. The resulted LY6G6F, VSIG10, TMEM25 or LSR ECD-mIgG2aFc Ig fused proteins (SEQ ID NOs: 23, 24, 25, or 26, respectively) are shown in FIGS. 10A-D, respectively.

The LY6G6F, VSIG10, TMEM25 or LSR ECD-mIgG2aFc fused proteins (SEQ ID NOs: 23, 24, 25, or 26, respectively), were cloned into GPEx® retrovectors, followed by retrovector transduction into Catalent's “in-house” CHO—S cell line. A pooled population was produced and the productivity was validated. The pool was then expanded and relative productivity and relative copy number of the pool was determined. Cell culture supernatants were analyzed by Catalent's Fc ELISA assay to confirm production of LY6G6F, VSIG10, TMEM25 or LSR ECD-mIgG2aFc fused proteins.

Protein solutions were tested for bioburden and endotoxin. Human fusion proteins composed of the human ECD of either of LY6G6F, VSIG10, TMEM25 or LSR ECD fused to human IgG1 (as depicted on FIG. 11) were also expressed using a similar system.

Assessment of the Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig Fusion Proteins on Mouse and Human T Cell Activation In Vitro Example 28

Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD-IG Fusion Proteins on Activation of DO11.10 Naïve CD4+ T Cells with OVA Peptide

Naive CD4⁺ T cells were isolated from spleens of five D011.10 mice (Jackson) via automax sort: CD4-negative sort (Miltenyi Cat #130-095-248), including anti-CD25 (Miltenyi Cat #130-091-072) in the negative sort cocktail, followed by CD62L-positive sort (Miltenyi Cat #130-049-701). Balb/c total splenocytes were also collected from one mouse, and irradiated with 3000 rads to serve as antigen presenting cells (APCs) for the DO11.10 CD4⁺ T cells. Naive CD4⁺ T cells were cultured at 5×10⁵ cells per well in flat-bottom 96-well plates with irradiated APCs at a ratio of 1:1 (APCs to T cells) in 200 ul of HL-1 medium, and activated with 20 ug/ml or 2 ug/ml OVA323-339 in the presence of either TMEM25-ECD-Ig (SEQ ID NO:25), LSR-ECD-Ig (SEQ ID NO:26), LY6G6F-ECD-Ig (SEQ ID NO:23) at the indicated concentrations. As positive controls, B7-H4-Ig (R&D Systems) or CTA4-Ig (mouse ECD fused to mIgG2a Fc) were used. Isotype control Ig (mIgG2a, BioXCell Cat. #BE0085) was used as a negative control. The cells were pulsed with 1 uCi of tritiated-thymidine at 24 hours, and harvested at 72 hours.

As shown in FIG. 30, TMEM25-ECD-Ig, LSR-ECD-Ig and LY6G6F-ECD-Ig elicit dose dependent inhibition of T cell activation. This was demonstrated as inhibition of T cell proliferation which was induced by OVA323-339 at 20 ug/ml (FIGS. 30 A-C, E) or 2 ug/ml (FIG. 30 D).

VSIG10-ECD-Ig fusion protein (SEQ ID NO:24) did not show activity in three experiments carried out in similar assay.

Example 29

Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD-IG Fusion Proteins on Activation of Naïve CD4⁺ T Cells with Anti-CD3/Anti-CD28 Coated Beads

Naive CD4⁺ T cells were isolated from 5 SJL (Harlan) mice via automax sort as described in the previous section. Beads were coated with anti-CD3 (0.5 ug/ml; clone 2C11) and anti-CD28 (2 ug/ml; clone 37.51 eBioscience) following manufacturer's protocol (Dynabeads M-450 Epoxy Cat. 140.11, Invitrogen), and with increasing concentrations of LSR-ECD-Ig or mIgG2a isotype control (mIgG2a, BioXCell Cat. #BE0085) (0.1-10 ug/ml). The total amount of protein used for beads coating with LSR-ECD-Ig was completed to 10 ug/ml with Control Ig. Naive CD4⁺ T cells (0.5×10⁶/well) were activated with the coated beads at a ratio of 1:2 (beads to T cells). The cells were pulsed with 1 uCi of tritiated-thymidine after 24 hours, and harvested after 72.

LSR-ECD-Ig (SEQ ID NO:26) pronouncedly inhibited proliferation of T cell proliferation and elicit its effect in a dose dependent manner (FIG. 31).

TMEM25, LY6G6F and VSIG10 ECD Ig fusion proteins shown in FIGS. 10 and 11 are tested in a similar assay with similar results.

Example 30

Dose Response Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD-IG Fusion Proteins on Mouse CD4+ T Cell Activation with Plate Bound Anti-CD3, as Manifested in Cytokine Production and Expression of the Activation Marker CD69.

Untouched CD4+CD25− T cells were isolated from pools of spleen and lymph node cells of BALB/C mice by negative selection using CD4+CD62L+ T cell isolation Kit (Miltenyi Cat #130-093-227) according to the manufacturer's instructions. The purity obtained was >95%.

Tissue culture 96-well plates were coated overnight at 4° C. with 2 ug/ml anti-CD3 mAb (clone 145-2C11) in the presence of LY6G6F, VSIG10, TMEM25 and LSR ECD-Ig fusion proteins (SEQ ID NOs: 23, 24, 25 and 26, respectively) at 1, 5 and 10 μg/ml. Control mIgG2a (Clone C1.18.4 from BioXCell; Cat #BE0085) was added to each well in order to complete a total protein concentration of 12 μg/ml per well. Wells were plated with 1×10⁵ CD4+CD25− T cells per well. At 48 hrs post stimulation, culture supernatants were collected and analyzed using mouse IFNγ ELISA kit, and cells were analyzed for expression of the activation marker CD69 by flow cytometry.

The results shown in FIG. 32 demonstrate inhibitory effects of LY6G6F, VSIG10, TMEM25 and LSR ECD-Ig fusion proteins on CD4 T cell activation, manifested by reduced IFNγ secretion (FIG. 32A) and reduced expression of CD69 (FIG. 324B) upon TCR stimulation, compared to control mIgG2a and CTLA4-Ig.

Example 31 The Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD-IG Fusion Proteins on CD4+ T Cell Differentiation In Vitro.

To test the ability of LY6G6F, VSIG10, TMEM25 and LSR Ig fusion proteins to inhibit CD4+ T cell differentiation, naïve CD4+ T cells are isolated from DO11.10 mice, which are transgenic for a T cell receptor (TCR) that is specific for OVA323-339 peptide. Using D011.10 T cells enables studying both polyclonal (anti-CD3/anti-CD28 mAbs) and peptide-specific responses on the same population of CD4+ T cells. Naïve CD4+ T cells are isolated from D011.10 mice and activated in culture in the presence of anti-CD3/anti-CD28 coated beads or OVA323-339 peptide plus irradiated BALB/c splenocytes, in the presence of LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins, control Ig, or B7-H4 Ig. The cells are activated in the presence of Th driving conditions as follows: Th0 cell- (IL-2), Th1 cell- (IL-2+IL-12), Th2 cell- (IL-2+IL-4), or Th17 cell- (TGF-β+IL-6+IL-23+anti-IL-2). The effects on T cell differentiation and Th-specific responses are assessed by measuring cell proliferation and subtype specific cytokine production: IL-4, IL-5, IL-10, IL-17, IFN-γ.

Example 32 Assessment of the Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD IG Fusion Proteins on Human T Cells Activation.

The effect of LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins on human T cell response is tested by two different in vitro assays using purified human T cells. In the first assay, human T cells are activated by anti-CD3 and anti-CD28 coated beads, and in the other assay, activation is carried out using anti-CD3 and anti-CD28 antibodies in the presence of autologous, irradiated PBMCs. The regulatory activity of LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins on human T cell activation, is evaluated by measuring cell proliferation and cytokine release.

Study I—Activation of Human T Cells with Anti-CD3 and Anti-CD28-Coated Beads is Inhibited by Fusion Proteins

Naïve CD4+ T cells are isolated from 4 healthy human donors and activated with anti-CD3 mAb/anti-CD28 mAb coated beads in the presence of control mIgG2a, or any one of the LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins. Two side-by-side culture sets are set up; one culture being pulsed at 24 hours with tritiated-thymidine and harvested at 72 hours while the second plate is harvested at 96 hours for cytokine production via LiquiChip.

Study II—Activation of Human T Cells with Irradiated Autologous PBMCs is Inhibited by Fusion Proteins

Total PBMCs are isolated from fresh blood of healthy human donors using ficoll gradient. 10×10⁶ total PBMCs are resuspended in Ex-Vivo 20 medium, and irradiated at 3000 rad. These cells are used to activate the isolated T cells in vitro, by presenting the anti-CD3, anti-CD28 and either of the test proteins. The rest of PBMCs are used for isolation of T cells using CD4+ T cell Isolation Kit II from Miltenyi.

For activation, 5×10⁵ isolated T cells are cultured in the presence of 5×10⁵ autologous irradiate PBMCs. Anti-CD3 (0.5 μg/ml), anti-CD28 (2 μg/ml) and either of LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins or control Ig (mIgG2a) are added in a soluble form. The cultures are pulsed with 1 uCi of triated thymidine at 24 hrs, and proliferation is measured at 72 hours.

Example 33 The Effect of LY6G6F, TMEM25 and LSR Proteins Upon Ectopic Expression in APC-Like Cells, on Human T Cell Responses

The effects of LY6G6F, TMEM25 and LSR on human T cell responses were evaluated following their ectopic expression in ‘T cell stimulator’ cells: a murine thymoma cell line, Bw5147, which were engineered to express membrane-bound anti-human CD3 antibody fragments, that can trigger the TCR-complex on human T cells, with or without co-expression of putative costimulatory or coinhibitory ligands.

Codon-optimized cDNAs encoding LY6G6F (SEQ ID NO: 1), TMEM25 (SEQ ID NO: 7) and LSR (SEQ ID NO: 11) were gene-synthesized and directionally cloned into a retroviral vector pCJK2 via Sfi-I sites. Monocistronic expression constructs were generated. The constructs were validated by agarose gel electrophoresis and were expressed in Bw5147 cells displaying high levels of membrane bound anti-CD3 antibody (Bw-3/2) (Leitner et al., 2010). As negative control Bw5147 cells transduced with “empty” vector (pCJK2) were used. In addition, Bw-3/2 cells expressing costimulatory molecules (ICOSL and CD70) and Bw-3/2-cells expressing coinhibitory molecules (B7-H3 and B7-H1/PD-L1) were also used as controls. Homogenously high expression of the stimulating membrane-bound anti-CD3 antibody was confirmed by FACS using a DyLight-649 anti-mouse IgG (H+L) antibody that reacts with the murine single chain antibody expressed on the stimulator cells. Presence and high level transcription of expression monocistronic constructs in the respective stimulator cells was confirmed by qPCR.

T cells were purified from buffy coats or heparinised blood derived from healthy volunteer donors and the mononuclear fraction was obtained by standard density centrifugation using Ficoll-Paque (GE-Healthcare). Untouched bulk human T cells were obtained through MACS-depletion of CD11b, CD14, CD16, CD19, CD33 and MHC-class II-bearing cells with the respective biotinylated mAb in conjunction with paramagnetic streptavidin beads (Leitner et al., 2009). Purified CD8 T cells and CD4 T cells were obtained by adding biotinylated CD4 and CD8 mAb to the pools. Naïve CD4 T cells were isolated using the Naïve CD4+ T cell Isolation Kit II (Miltenyi Biotec). Following isolation, cells were analyzed for purity by FACS, and samples with sufficient purity (>90%) were used for the experiments.

The stimulator cells were harvested, counted, irradiated (2×3000 rad) and seeded in flat-bottom 96-well plates (20000 cells/well). Liquid nitrogen stored MACS-purified T cells were thawed, counted and added to the wells at 100.000 cells per well; total volume was 200 μl/well. Triplicate wells were set up for each condition. Following 48 hours of co-culture, ³H-thymidine (final concentration of 0.025 mCi; Perkin Elmer/New England Nuclear Corporation, Wellesley, Mass.) was added to the wells. Following further culturing for 18 hours, the plates were harvested on filter-plates and incorporation of ³H-Thymidine was determined as described in Pfistershammer et al., 2004. In addition, a series of experiments with MACS-purified T cell subsets (CD8 T cells, CD4 T cells, and naïve CD45RA-positive CD4 T cells) were performed. Additional controls in all experiments included wells with stimulator cells alone to assess the cells microscopically and also to determine basal ³H-Thymidine incorporation of the stimulator cell w/o T cells. Results with stimulator cells that quickly disintegrated following irradiation were excluded from the analysis.

Results shown in FIG. 33 are an average of several experiments, and show the effect of stimulator cells expressing LY6G6F, TMEM25 or LSR on the proliferation of human bulk T cells (FIG. 33A), CD4+ T cells (FIG. 33B), CD8+ T cells (FIG. 33C), or naïve CD4 CD45RA+ T cells (FIG. 33D). Expression of control costimulatory molecules (ICOSL and CD70) resulted in a consistent and pronounced stimulation of proliferation of all cell subtypes. Similarly to expression of control coinhibitory molecules (B7-H3 and B7-H1/PD-L1), which resulted in a mild inhibition of proliferation of different T cell subtypes, expression of LY6G6F, TMEM25 and LSR also resulted in a mild inhibition of T cell proliferation, with the most pronounced inhibitory effects exhibited on CD8+ T cells.

Example 34

Characterizing the Target Cells for LY6G6F, VSIG10, TMEM25 and/or LSR Proteins by Determining their Binding Profile to Immune Cells

Splenocytes from DO11.10 mice (transgenic mice in which all of the CD4+ T cells express a T cell receptor that is specific for OVA323-339 peptide) are activated in the presence of OVA323-339 peptide, and cells are collected at t=0, 6, 12, 24, and 48 hours following initial activation to determine which cell type is expressing a receptor for LY6G6F, VSIG10, TMEM25 and/or LSR over time. Cells are then co-stained for CD3, CD4, CD8, B220, CD19, CD11b, and CD11c.

Example 35 Assessment of the Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD IG Fusion Proteins on the Ability of B Cells to Class-Switch and Secrete Antibody

Resting B cells are isolated from unprimed C57BL/6 mice and activated in vitro in the presence of anti-CD40 plus (i) no exogenous cytokine, (ii) IL-4, or (iii) IFN-γ. The cell cultures receive control Ig (mIgG2a), anti-CD86 mAb (as a positive control for increased Ig production), or any one of LY6G6F, VSIG10, TMEM25 and LSR ECD fusion proteins described in Example 5 herein, at the time of culture set up, and are cultured for 5 days. The LY6G6F, VSIG10, TMEM25 and LSR ECD fusion proteins are tested at three concentrations each. At the end of culture, supernatants are tested for the presence of IgM, IgG1, and IgG2a via ELISA. If there appears to be an alteration in the ability of the B cells to class-switch to one isotype of antibody versus another, then the number of B cells that have class switched is determined via ELISPOT. If there is an alteration in the number of antibody producing cells, then it is determined if there is an alteration in the level of γ1- and γ2a-sterile transcripts versus the mature transcripts for IgG1 and IgG2a.

Assessment of the Therapeutic Effect of LY6G6F, VSIG10, TMEM25 or LSR ECD Ig Fusion Proteins for Treatment of Autoimmune Diseases Example 36 Efficacy of LY6G6F, VSIG10, TMEM25 or LSR ECD IG Fusion Proteins in Mouse R-EAE Model of Multiple Sclerosis

The therapeutic effect of TMEM25-ECD-Ig, LSR-ECD-Ig and VSIG10-ECD-Ig fusion proteins (SEQ ID NOs: 25, 26 and 24, respectively) for treatment of autoimmune diseases was tested in a mouse model of Multiple Sclerosis; Relapsing Remitting Experimental Autoimmune Encephalomyelitis (R-EAE):

Female SJL mice 6 weeks old were purchased from Harlan and maintained in the CCM facility for 1 week prior to beginning the experiment. Mice were randomly assigned into groups of 10 animals and primed with 50 μg PLP139-151/CFA on day 0. Mice received 6 i.p. injections of 100 ug/dose of TMEM25-ECD-Ig (SEQ ID NO: 25), LSR-ECD-Ig (SEQ ID NO: 26), mIgG2a isotype control, or CTLA4-Ig (mouse ECD fused to mouse IgG2a Fc) as positive control. Treatments began at the time of onset of disease remission and were given 3 times per week for 2 weeks. Mice were followed for disease symptoms. On day 35, (during the peak of disease relapse) 5 mice of each group were assayed for DTH (delayed type hypersensitivity) response to disease inducing epitope (PLP139-151) and to relapse-associated myelin epitope (PLP178-191) via injection of 10 μg of PLP139-151 in one ear and PLP178-191 into the opposite ear. The level of ear swelling was assayed at 24 hours post challenge.

The present Example shows a pronounced decrease in disease severity of R-EAE-induced mice upon treatment with TMEM25-ECD-Ig (SEQ ID NO: 25) or LSR-ECD-Ig (SEQ ID NO: 26), in a therapeutic mode with 100 ug/dose at 3 times per week, as shown in FIG. 34A. The level of inhibition was similar to that of CTLA4-Ig.

In addition, treatment of R-EAE mice with TMEM25-ECD-Ig (SEQ ID NO: 25) or LSR-ECD-Ig (SEQ ID NO: 26) dramatically inhibited DTH responses to the disease inducing epitope (PLP139-151) and to relapse-associated epitope (PLP178-191) at day 35 (FIG. 34B).

To test the dose dependency of the efficacy of TMEM25-ECD-Ig (SEQ ID NO: 25) as well as its mode of action in the PLP-induced R-EAE model, disease was induced as described above and mice were treated from onset of disease remission with 100, 30 or 10 ug/dose TMEM25-ECD-Ig, 3 times per week over two weeks. TMEM25-ECD-Ig decreased the level of disease severity in a dose dependent manner as shown by the milder effect observed by the lowest dose tested (10 ug/dose), which is significantly different from the effect of the high dose (100 ug/dose) (FIG. 35A). TMEM25-ECD-Ig also inhibited DTH responses to spread epitopes PLP178-191 and MBP84-104 on days 45 and 76 (FIG. 35B). Furthermore, TMEM25-ECD-Ig inhibited recall responses of day 45 and day 76 splenocytes and day 45 cervical lymph node cells, to PLP139-151, PLP178-191 and MBP84-104 (FIGS. 35C and 35D). This was manifested mainly in inhibition of proliferation as well as reduction in IFNγ and IL-17 release. TMEM25-ECD-Ig also inhibits IL-4 and IL-10 release from cervical lymph node cells of mice treated at 30 ug/dose TMEM25-ECD-Ig. There was no consistent effect on IL-4 and IL-10 release from splenocytes under these conditions.

The beneficial effect of TMEM25-ECD-Ig (SEQ ID NO: 25) in the R-EAE model was also accompanied by a significant reduction in the infiltration of immune cells to the CNS (FIG. 35E). Although none of the lineages tested in the CNS was significantly changed, there was a clear trend for reduction in CD4+ T cells and Dc (CD11.C+) and some increase in the B cell (CD19+) population, although this did not reach statistical significance (FIG. 35E).

VSIG10-ECD-Ig (SEQ ID NO: 24) was also tested in the PLP-induced R-EAE model described above. Treatments began on the day of onset of remission and given at 100 ug/dose 3×/week over 2 weeks. VSIG10-ECD-Ig significantly reduced disease severity as manifested in reduction in disease score (FIG. 36A). The beneficial effect of VSIG10-ECD-Ig in this model was also accompanied by inhibition of day 45 and day 76 DTH responses to spread epitopes PLP178-191 and to MBP84-104 (FIG. 36B). In addition, VSIG10-ECD-Ig (SEQ ID NO: 24) inhibited recall responses of splenocytes and draining (cervical) lymph node cells taken on day 45, in response to activation with inducing epitope PLP139-151, or spread epitopes PLP178-191 and MBP84-104 (FIGS. 36C and 36D). This was manifested in inhibition of cell proliferation as well as secretion of IFNg, IL-17, IL-4 and IL-10.

Interestingly, on day 76 VSIG10-ECD-Ig (SEQ ID NO: 24) inhibited only MBP84-104 induced splenocytes proliferation, but not proliferation induced by the earlier myelin epitopes, (FIG. 36C). VSIG10-ECD-Ig treatment in the R-EAE model also significantly reduced the infiltration of immune cells to the CNS which was accompanied by evident but not significant elevation in the number of cells in the lymph nodes, (FIG. 36E). The major cell subtype that was reduced in the CNS was CD4+ T cells, however, there was also a clear trend of reduction of CD19+ B cells and CD11c+ Dcs in the CNS. All these immune cell subtypes were significantly elevated in the lymph nodes, suggesting that VSIG10-ECD-Ig may inhibit trafficking of immune cells from the lymph nodes to the CNS.

LY6G6F-ECD-Ig fusion protein is studied in a similar model of Multiple Sclerosis.

Example 37 Efficacy of LY6G6F, VSIG10, TMEM25 or LSR ECD IG Fusion Proteins in Mouse CIA Models of Rheumatoid Arthritis

Study I: LSR-ECD-Ig (SEQ ID NO: 26) was tested in mouse model of collagen-induced arthritis (CIA) which is a model of rheumatoid arthritis. Male DBA/1 mice were housed in groups of 8-10, and maintained at 21° C.±2° C. on a 12 h light/dark cycle with food and water ad libitum. Arthritis was induced by immunisation with type II collagen emulsified in complete Freund's adjuvant. Mice were monitored on a daily basis for signs of arthritis. On the appearance of arthritis (day 1) treatment with LSR-ECD-Ig (SEQ ID NO: 26), mIgG2a isotype control or CTLA4-Ig (mouse ECD fused to mouse IgG2a Fc) as positive control (100 ug/dose, each) was initiated and given 3 times per week for 10 days. Hind footpad swelling was measured (using microcalipers), as well as the number and degree of joint involvement in all four limbs. This yielded two measurements, clinical score and footpad thickness that can be used for statistical assessment.

At the end of the treatment period mice were bled and sacrificed. For histological analysis, paws were removed at post mortem, fixed in buffered formalin (10% v/v), then decalcified in EDTA in buffered formalin (5.5% w/v). The tissues are then embedded in paraffin, sectioned and stained with haematoxylin and eosin. The scoring system is as follows:

0=normal; 1=synovitis but cartilage loss and bone erosions absent or limited to discrete foci; 2=synovitis and significant erosions present but normal joint architecture intact; 3=synovitis, extensive erosions, joint architecture disrupted.

The present Example shows that treatment of mice with established CIA with LSR-ECD-Ig at 100 ug/dose 3 times/week for 10 days resulted in potent reduction of clinical score (FIG. 37A) and paw swelling (FIG. 37B) and histological damage (FIG. 37C). The efficacy of LSR-ECD-Ig (SEQ ID NO: 26) was similar to that obtained with CTLA4-Ig.

The efficacy of TMEM25-ECD-Ig, VSIG10-ECD-Ig and LY6G6F-ECD-Ig is evaluated in this CIA model.

Treatment with TMEM25-ECD-Ig (SEQ ID NO: 25) or with LSR-ECD-Ig (SEQ ID NO: 26) did not show efficacy in a more severe CIA model in which a boost with type II collagen emulsified in complete Freund's adjuvant is given on day 21. In this severe CIA Enbrel, a positive control, given at the same regimen and dosage, had very weak efficacy. Treatment with TMEM25-ECD-Ig also did not show a therapeutic effect in a CIA model with a collagen type II boost without the adjuvant given on day 21.

Study II: The efficacy of LY6G6F ECD Ig fusion protein in the CIA model was studied using a modified CIA model as follows: female DBA/1 mice (Taconic Farms, 9-11 weeks old) were acclimated for 7 days. On day 0, mice were immunized with chicken collagen/CFA, 0.05 mL EK-0210 emulsion/mouse (Hooke Laboratories, Inc.) and on day 20 a booster with chicken collagen/IFA, 0.05 mL EK-0211 emulsion/mouse (Hooke Laboratories, Inc.) was injected. Mice were scored daily and enrolled into one of the following treatment groups on the day of onset of arthritis:

Group 1: LY6G6F-ECD-Ig (SEQ ID NO: 23), i.p., Q2D, 30 mg/kg for 2 wks, 10 mL/kg.

Group 2: Vehicle (PBS) Q2D, for 2 wks, 10 mL/kg (negative control).

From the time of enrolment, mice were scored every other day for clinical signs and ankylosis according to the following scoring system:

Clinical Score:

0 Normal paw. 1 One toe inflamed and swollen. 2 More than one toe, but not entire paw, inflamed and swollen, OR Mild swelling of entire paw. 3 Entire paw inflamed and swollen. 4 Very inflamed and swollen paw or ankylosed paw. If the paw is ankylosed, the mouse cannot grip the wire top of the cage.

Ankylosis Score:

Paw Score Clinical Observations 0 No ankylosis 1 Mild ankylosis 2 Moderate ankylosis 3 Severe ankylosis

The present Example shows that treatment of mice with established CIA with 30 mg/kg LY6G6F-ECD-Ig Q2D over 2 weeks from onset of arthritis resulted in alleviation of disease manifested in reduction of disease score (FIG. 38).

The efficacy of VSIG10-ECD-Ig (SEQ ID NO: 24) and TMEM25-ECD-Ig (SEQ ID NO: 25) is evaluated in a similar model.

Study III: Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD-IG Fusion Proteins on Tolerance Induction in Transfer Model of CIA

To further understand the effect of LY6G6F, VSIG10, TMEM25 and LSR ECD-Ig fusion proteins on immune regulation, the ability of these proteins to induce tolerance in a transfer model of arthritis is analysed.

In brief, spleen and LN cells from arthritic DBA/1 mice treated for 10 days with LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins (SEQ ID NOs: 23, 24, 25 and 26, respectively) or control Ig2a are removed and injected i.p into T-cell deficient C.B-17 SCID recipients. The mice then receive an injection of 100 μg type II collagen (without CFA), necessary for successful transfer of arthritis. Arthritis is then monitored in the SCID mice. Histology is performed and anti-collagen antibody levels are measured to determine that the LY6G6F, V SIG10, TMEM25 and LSR ECD Ig fusion proteins treatment confers long-term disease protection.

Example 38 Assessment of the Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD-IG Fusion Proteins in a Viral Infection Model of TMEV

Theiler's murine encephalomyelitis virus (TMEV) is a natural endemic pathogen of mice that causes an induced demyelinating disease (TMEV-IDD) in susceptible strains of mice (SJL/J, H-2KS) that resembles the primary progressive form of MS (Munz et al., Nat Rev Immunol 2009; 9:246-58). TMEV infection results in a life-long persistent virus infection of the CNS leading to development of a chronic T cell-mediated autoimmune demyelinating disease triggered via de novo activation of CD4 T cell responses to endogenous myelin epitopes in the inflamed CNS (i.e. epitope spreading) (Miller et al., Nat Med 1997; 3:1133-6; Katz-Levy et al., J Clin Invest 1999; 104:599-610).

SJL mice clear the majority of the virus within 21 days post infection, however a latent viral infection is maintained and infect microglia, astrocytes, and neurons. Disease symptoms are manifested around day 25-30 post infection.

The effect of treatment with LY6G6F, VSIG10, TMEM25 or LSR Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) on acute and chronic phases of viral infection is studied in the TMEV-IDD model by assessment of viral clearance and disease severity.

Method:

Female SJL/J mice (5-6 weeks) are infected with TMEV by intracranial inoculation in the right cerebral hemisphere of 3×10⁷ plaque forming units (PFU) of the BeAn strain 8386 of TMEV in 30 ul serum-free medium. From day 2 post infection mice are treated with Control Ig, LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins, at 100 ug/dose each; 3 doses/week for 2 weeks.

Mice are followed for clinical scoring. On day 7 and day 14 post infection (after 3 and 6 treatments respectively) brains and spinal cords are collected from 5 mice in each treatment group for plaque assays. The tissues are weighted so that the ratio of PFU/mg of CNS tissue could be calculated after the plaque assay is completed.

TMEV Plaque Assay:

Brains and spinal cords of mice treated with Control Ig (mouse IgG2a), or with each of LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) are collected at days 7 and 14 post-infection from non-perfused anesthetized mice. The Brains and spinal cords are weighed, and homogenized. CNS homogenates are serially diluted in DMEM and added to tissue culture-treated plates of confluent BHK-21 cells for 1 h incubation at room temperature, with periodic gentle rocking.

A media/agar solution is mixed 1:1 (volume:volume), added to cells and allowed to solidify at room temperature. The plates are then cultured at 34 deg C. for 5 days. At the end of culture, 1 ml of formalin is added and incubated at room temperature for 1 h to fix the BHK monolayer. The formalin is poured off into a waste container, and the agar is removed from the plates. Plaques are visualized by staining with crystal violet for 5 min, and plates are gently rinsed with diH2O. To determine PFU/ml homogenate, the number of plaques on each plate is multiplied by the dilution factor of the homogenate and divided by the amount of homogenate added per plate. The PFU/ml is divided by the weight of the tissue to calculate PFU/mg tissue.

Example 39 Assessment of the Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD-IG Fusion Proteins on Primary and Secondary Immune Response to Viral Infection in a Mouse Model of Influenza

To test the effect of LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) on primary and secondary immune responses to viral infection, BALB/c naïve mice (for primary immune responses) and ‘HA-memory mice’, is used, as well as ‘polyclonal flu-memory mice’ (to assess secondary responses mediated by memory CD4 T cells), which are generated as detailed in Teijaro et al., J Immunol. 2009: 182; 5430-5438, and described below.

To obtain ‘HA-memory mice’, first HA-specific memory CD4 T cells are generated, naive CD4 T cells are purified from spleens of HA-TCR mice [BALB/c-HA mice which express transgenic T cell receptor (TCR) specific for influenza hemagglutinin (HA) peptide (110-119)] and primed in vitro by culture with 5.0 microg/ml HA peptide and mitomycin C-treated, T-depleted BALB/c splenocytes as APCs for 3 days at 37° C. The resultant activated HA-specific effector cells are transferred into congenic BALB/c (Thy1.1) hosts (5×10⁶ cells/mouse) to yield “HA-memory mice” with a stable population of HA-specific memory CD4 T cells.

To obtain ‘polyclonal-memory mice’, first polyclonal influenza-specific memory CD4 T cells are generated, by infecting BALB/c mice intranasally with a sublethal dose of PR8 influenza, CD4 T cells are isolated 2-4 months postinfection, and the frequency of influenza-specific memory CD4 T cells is determined by ELISPOT. CD4 T cells from previously primed mice are transferred into BALB/c hosts to generate “polyclonal flu-memory” mice with a full complement of endogenous T cells.

Primary and secondary responses to influenza virus are tested by infecting naïve BALB/c mice or BALB/c-HA memory mice and BALB/c ‘polyclonal flu-memory mice’ with sublethal or lethal doses of PR8 influenza virus by intranasal administration.

Mice are treated with LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins or with mIgG2a control before and following influenza challenge. Weight loss and mortality will be monitored daily. Six days after the challenge, viral content in the bronchoalveolar lavage (BAL) is analyzed by collecting lavage liquid and testing the supernatant for viral content by determining the tissue culture infectious dose 50% (TCID50) in MDCK cells. In addition, lung tissue histopathology is performed.

To test the effect LY6G6F, VSIG10, TMEM25 and LSR ECD-Ig fusion proteins on T cell expansion BALB/c or BALB/c-HA memory mice or BALB/c ‘polyclonal flu-memory mice’ are infected as above and administered with BrdU (1 mg/dose) on days 3, 4 and 5 post infection. On day 6, spleen and lung are harvested and BrdU incorporation is estimated. Cytokine production by lung memory CD4 T cells during influenza challenge is also studied in HA-specific memory CD4 T cells stimulated in vitro with HA peptide in the presence LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins or with IgG2a for 18 hours.

Example 40 Assessment of the Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD-IG Fusion Proteins on Primary and Secondary CD8 T Cell Response to Viral Infection in a Mouse Model of Influenza

The effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) on primary CD8 T cell responses to influenza virus is studied according to methods as described in the literature (Hendriks et al., J Immunol 2005; 175; 1665-1676; Bertram et al., J Immunol. 2004; 172:981-8) using C57BL/6 mice infected with influenza A HKx31 by intranasal or intraperitoneal administration. LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins or mIgG2a control are administered during priming. Animal weight loss and mortality is monitored daily. To follow virus-specific CD8+ T cells, MHC H-2Db tetramers loaded with the major CD8 T cell epitope, the NP₃₆₆₋₃₇₄ peptide are used. Virus-specific H-2D^(b)/NP366-374+ CD8+ T cells in the lung, draining lymph nodes, and spleen are expected to reach a peak around day 8-10 post infection and decline thereafter to only 1.5% virus-specific CD8 T cells (Hendriks et al J Immunol 2005; 175; 1665-1676; Bertram et al., J Immunol. 2002; 168:3777-85; Bertram et a., J Immunol. 2004; 172:981-8). Thus, mice are sacrificed at days 8 and 21 post infection, and virus-specific CD8 T cell numbers is evaluated in the lung, draining lymph nodes and spleen. Viral clearance is assessed. CD8 T cell responses are evaluated in spleen cell suspensions, and include intracellular IFN-γ staining and CTL activity, as previously described (Bertram et a., J Immunol. 2004; 172:981-8) and detailed below.

Cells are surface-stained with FITC-conjugated anti-mouse CD62L, PE-conjugated anti-mouse CD8 to measure CD8+ activated T cells (or anti-mouse CD4 to follow CD4+ cells). In addition to these Abs, allophycocyanin-labeled tetramers consisting of murine class I MHC molecule H-2D^(b), β₂-microglobulin, and influenza NP peptide, NP₃₆₆₋₃₇₄ are used to measure influenza-specific CD8 T cells. For intracellular IFN-γ staining, cell suspensions are restimulated in culture medium for 6 h at 37° C. with 1 μM NP₃₆₆₋₃₇₄ peptide and GolgiStop (BD PharMingen, San Diego, Calif.). Cells are then harvested, resuspended in PBS/2% FCS/azide, and surface stained with PE-anti-CD8 and FITC-anti-CD62L as described above. After surface staining, cells will be fixed in Cytofix/Cytoperm solution (BD PharMingen) and then stained with allophycocyanin-conjugated antimouse IFN-γ diluted in 1× perm/wash solution (BD PharMingen). Samples are analyzed by Flow Cytometry.

For cytotoxicity assays (CTL responses) splenocytes from influenza-infected mice are incubated for 2 h at 37° C. to remove adherent cells. Serial 3-fold dilutions of effectors are assayed for anti-influenza NP₃₆₆₋₃₇₄-specific CTL activity against ⁵¹Cr-labeled EL4 cells pulsed with 50 μM NP₃₆₆₋₃₇₄ peptide for 6 h as described by Bertram et al 2002 and Bertram et al 2004.

At 3 weeks postinfection, some mice are rechallenged with the serologically distinct influenza A/PR8/34 (PR8), which shares the NP gene with influenza A HKx31, but differs in hemagglutinin and neuraminidase, so that neutralizing Abs do not limit the secondary CTL response. Mice are sacrificed at days 5 & 7 following virus rechallenge, and virus-specific CD8 T cell numbers is evaluated in the lung, draining lymph nodes and spleen as described by Hendriks et al and Bertram et al (Hendriks et al., J Immunol 2005; 175; 1665-1676; Bertram et al., J Immunol. 2004; 172:981-8) and detailed above. Secondary CD8 T cell responses, including intracellular IFN-γ staining and CTL activity, are evaluated in spleen cell suspensions of mice at days 5 & 7 following virus rechallenge, as described above.

To determine the effect of LY6G6F, VSIG10, TMEM25 and LSR ECD-Ig fusion proteins on expansion and accumulation of memory CD8+ T cells during the secondary response, adoptive transfer experiments are performed, according to methods previously described (Hendriks et al., J Immunol 2005; 175; 1665-1676; Bertram et al., J Immunol. 2004; 172:981-8): mice are immunized with influenza A HKx31. Twenty-one days later, T cells are purified from spleens on mouse T cell enrichment immunocolumns (Cedarlane Laboratories, Hornsby, Ontario, Canada) and labeled with CFSE (alternatively Thy1.1 congenic mice are used as recipients). Equal numbers of tetramer-positive T cells are injected through the tail vein of recipient mice. Mice are rechallenged with influenza virus as described above, and 7 days later splenocytes are evaluated for donor virus-specific CD8 T cells, as detailed above.

Example 41 Assessment of Protein Expression in Exhausted T Cells, and the Binding and Effect of the LY6G6F, VSIG10, TMEM25 and LSR ECD-IG Fusion Proteins on Reversing Exhausted T Cell Phenotype

Memory CD8 T-cell differentiation proceeds along distinct pathways after an acute versus a chronic viral infection (Klenerman and HillNat Immunol 6, 873-879, 2005). Memory CD8 T cells generated after an acute viral infection are highly functional and constitute an important component of protective immunity. In contrast, chronic infections are often characterized by varying degrees of functional impairment of virus-specific T-cell responses, and this defect is a principal reason for the inability of the host to eliminate the persisting pathogen. Although functional effector T cells are initially generated during the early stages of infection, they gradually lose function during the course of the chronic infection leading to exhausted phenotype characterized by impaired T cell functionality.

Study I. The Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig Fusion Proteins on Clearance of Viral Infection and on T Cell Functions During Acute and Chronic Viral Infection.

The effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) on acute and chronic viral infection is evaluated in a mouse model of infection with LCMV (lymphocytic chroriomeningitis virus) according to methodology described by Wherry et al J. Virol. 77: 4911-4927, 2003 and Barber et al Nature, 2006, and detailed below.

Two LCMV strains that can cause either acute or chronic infections in adult mice are used; the Armstrong strain which is cleared within a week, and the clone 13 strain which establishes a persistent infection that can last for months. As these two strains differ in only two amino acids, preserving all known T cell epitopes, it is possible to track the same CD8 T cell responses after an acute or chronic viral infection. In contrast to the highly robust memory CD8 T cells generated after an acute Armstrong infection, LCMV-specific CD8 T cells become exhausted during a persistent clone 13 infection (Wherry et al J. Virol. 77: 4911-4927, 2003; Barber et al., Nature. 2006; 439:682-7).

Mice are infected with 2×10⁵ PFU of Armstrong strain of LCMV intraperitoneally to initiate acute infection or 2×10⁶ PFU of Cl-13 intravenously to initiate chronic infection. Mice are treated i.p. with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins or with mIgG2a control, and with specific anti-LY6G6F, anti-VSIG10, anti-TMEM25, anti LSR—antibody or an isotype control.

The mice are monitored for numbers of virus specific CD8 T cells in the spleen, using virus-specific MHC tetramer epitopes, such as D^(b)NP₃₉₆₋₄₀₄ and D^(b)GP₃₃₋₄₁ which differ in acute or chronic infections. CD8 T cell functional assays, such as intracellular cytokines levels and CTL activity, are carried out as described by Wherry et al J. Virol. 77: 4911-4927, 2003, and similarly to those described in Example 40. Additional assays include production by splenocytes after stimulation with virus specific epitopes; and assessment of viral titers in the serum and in the spleen, liver, lung and kidney (Wherry et al J. Virol. 77: 4911-4927, 2003; Barber et al., Nature. 2006; 439:682-7).

Study II.

Assessment of LY6G6F, VSIG10, TMEM25 and LSR expression on exhausted T cells and binding of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins to exhausted T cells in order to evaluate regulation of these proteins or their counterpart receptors during exhaustion of T cells:

T cells are isolated from mice with chronic LCMV infection induced with Cl-13 strain. The cells are co-stained with fluorescently labeled anti-PD-1 Ab as positive control (PD-1 is highly expressed by exhausted T cells) and biotinylated LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins or biotinylated anti-LY6G6F, anti-VSIG10, anti-TMEM25 and anti-LSR fusion proteins antibodies, and respective isotype control. Binding is detected by FACS analysis using fluorescently labeled streptavidin.

Example 42

Assessment of LY6G6F, VSIG10, TMEM25 and/or LSR Protein Expression in Follicular Helper T (Tfh) Cells and the Binding of Ig Fusion Proteins to Tfh Cells

Follicular helper T (Tfh) cells are a subset of CD4+ T cells specialized in B cell help (reviewed by Crotty, Annu. Rev. Immunol. 29: 621-663, 2011). Tfh cells migrate into B cell follicles within lymph nodes, and interact with cognate B cells at the T cell-B cell border and subsequently induce germinal center B cell differentiation and germinal center formation within the follicle (Reviewed by Crotty, Annu. Rev. Immunol. 29: 621-663, 2011). The requirement of Tfh cells for B cell help and T cell-dependent antibody responses, indicates that this cell type is of great importance for protective immunity against various types of infectious agents, as well as for rational vaccine design.

Tfh cells are readily identifiable at the peak of the CD4+ T cell response to an acute lymphocytic choriomeningitis virus (LCMV) infection as CXCR5^(hi)SLAM^(lo)BTLA^(hi)PD1^(hi)Bcl6⁺ virus-specific CD4+ T cells (Choi et al 2011, Immunity 34: 932-946). T cells are isolated from mice with acute LCMV infection induced with 2×10⁵ PFU of Armstrong strain of LCMV administered intraperitoneally. The cells are co-stained with fluorescently labeled antibodies for markers of Tfh (CXCR5, PD1, BTLA, Bcl6) which are highly expressed by Tfh cells, and biotinylated LY6G6F, VSIG10, TMEM25 and LSR ECD-Ig fusion proteins or biotinylated antibodies specific for LY6G6F, VSIG10, TMEM25 and LSR, and respective isotype controls. Binding of Fc fused protein or antibody is detected by FACS analysis using fluorescently labeled streptavidin.

Example 43 Assessment of the Effect of LY6G6F, VSIG10, TMEM25 and LSR IG Fusion Proteins on Follicular Helper T (Tfh) Cells Generation and Activity

In order to investigate the effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins on Tfh differentiation and development of B cell immunity in vivo, C57BL/6 are treated with LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins and an isotype control throughout the course of an acute viral infection with Armstrong strain of LCMV (lymphocytic choriomeningitis virus). Tfh differentiation and Bcl6 protein expression is assessed by FACS analysis as described by Eto et al 2011 (PLoS One 6: e17739). Splenocytes are analyzed 8 days following LCMV infection, Tfh generation (CD44^(hi)CXCR5^(hi)SLAM^(lo)) and Bcl6 expression is evaluated by FACS analysis. In addition, the effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) on antigen-specific B cell responses is evaluated as described by Eto et al 2011 (PLoS One 6: e17739), including titers of anti-LCMV IgG in the serum at 8 days following LCMV infection, and quantitation by FACS analysis of plasma cell (CD138⁺IgD⁻) development at 8 days post-infection, gated on CD19+ splenocytes.

Example 44

The Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD IG Fusion Proteins in Modulation of type 1 Diabetes in NOD Mice, CD28-KO NOD, and B7-2-KO NOD

The effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins are studied in a widely used mouse model of type 1 diabetes: nonobese diabetic (NOD) mice which develop spontaneous In NOD mice, spontaneous insulitis, the hallmark pathologic lesion, evolves through several characteristic stages that begin with peri-insulitis and end with invading and destructive insulitis and overt diabetes. Peri-insulitis is first observed at 3-4 wk of age, invading insulitis at 8-10 wk, and destructive insulitis appears just before the onset of clinical diabetes, with the earliest cases at 10-12 wk. At 20 wk of age, 70-80% of female NOD mice become diabetic (Ansari et al 2003 J. Exp. Med. 198: 63-69).

Two KO mice: CD-28-KO NOD mice and B7-1/B7-2 double KO NOD mice, —which develop accelerated diabetes (Lenschow et al 1996 Immunity 5: 285-293; Salomon et al 2000 Immunity 12: 431-440), are also used.

Study I:

NOD mice are treated with LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) early and late phases during the evolution of diabetes, before or after disease onset, to examine the effects of these compounds on disease pathogenesis and to demonstrate that such treatment reduces disease onset and ameliorates pathogenesis. To study the effect on insulitis, blood glucose levels are measured 3 times/week, for up to 25 weeks (Ansari et al 2003 J. Exp. Med. 198: 63-69).

Mechanism of disease modification and mode of action is studied by experimental evaluation of individual immune cell types: pancreas, pancreatic LNs and spleen will be harvested to obtain Tregs, Th subtypes and CD8 T cells, DCs and B cells. Effect on cytokines secretion from cells isolated from pancreas, pancreatic LN and spleen is analysed, focused on IFNg, IL-17, IL-4, IL-10 and TGFb. Upon effect of the tested compounds, the mechanism of disease modification is studied by examination of individual immune cell types (including Tregs, Th subtypes and CD8 T cells, DCs and B cells); cytokines (IFNg, IL-17, IL-4, IL-10 and TGFb) and histology. Histologycal analysis of the pancreas is carried out to compare the onset of insulitis, and the lymphocyte infiltration.

Study II—the Effect of LY6G6F IG FUSION PROTEINS in Modulation of Type 1 Diabetes in Adoptive Transfer Model

To further investigate the mode of action of the Ig fusion proteins, an adoptive transfer model of diabetes is used. T cells from diabetic or prediabetic NOD donors are transferred to NOD SCID recipient mice. These mice are monitored for development of diabetes. The urine glucose and blood glucose, and assess histology of the pancreas, and T cell responses are monitored as described in the previous example.

Study III: Diabetes is also induced by the transfer of activated CD4+CD62L+CD25− BDC2.5 T cells (transgenic for TCR recognizing islet specific peptide 1040-p31 activated by incubation with 1040-p31) to NOD recipients. Mice are treated with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins, control mIgG2a or positive control. Treatments begin 1 day following transfer. Mice are followed for glucose levels 10-28 days post transfer (Bour-Jordan et al., J Clin Invest. 2004; 114(7):979-87).

Seven days post treatment pancreas, spleen, pancreatic LN and peripheral lymph node cells are extracted and examined for different immune cell populations. In addition, recall responses are measured by testing ex-vivo proliferation and cytokine secretion in response to p31 peptide.

LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins prevent or reduce disease onset or the severity thereof in the above studies.

Example 45 The Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD IG Fusion Proteins in Lupus Mouse Models

Study I: The lupus-prone mouse model, (NZB×NZW)F1 (B/W) is used. Cyclophosphamide (CTX) is the primary drug used for diffuse proliferative glomerulonephritis in patients with renal lupus, Daikh and Wofsy reported that combination treatment with CTX and CTLA4-Ig was more effective than either agent alone in reducing renal disease and prolonging survival of NZB/NZW Fl lupus mice with advanced nephritis (Daikh and Wofsy, J Immunol, 166(5):2913-6 (2001)). In the proof-of-concept study, treatments with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins and CTX either alone or in combination are tested.

Blood samples are collected 3 days before the protein treatment and then every other week during and after treatments for plasma anti-dsDNA autoantibody analysis by ELISA. Glomerulonephritis is evaluated by histological analysis of kidneys. Proteinuria is measured by testing fresh urine samples using urinalysis dipsticks.

LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) have a beneficial effect in at least ameliorating lupus nephtiris.

Study II:

The NZM2410-derived B6.Sle1.S1e2.S1e3 mouse model of SLE is used. NZM2410 is a recombinant inbred strain produced from NZB and NZW that develops a highly penetrant lupus-like disease with an earlier onset of disease (Blenman et al 2006 Lab. Invest. 86: 1136-1148). The effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins is studied in this model by assessment of proteinuria and autoantibodies as described above.

Study III:

An induced lupus model is used. This model is based on chronic graft-vs-host (cGVH) disease induced by the transfer of Ia-incompatible spleen cells from one normal mouse strain (such as B6.C-H2(bm12)/KhEg (bm12)) to another (such as C57BL/6), which causes an autoimmune syndrome resembling systemic lupus erythematosus (SLE), including anti-double-stranded DNA (anti-dsDNA) autoantibodies and immune complex-type proliferative glomerulonephritis (Appleby et al Clin. Exp. Immunol. 1989 78: 449-453); Eisenberg and Choudhury 2004 Methods Mol. Med. 102:273-284).

Lupus is induced in this model following injection of spleen cells from bm12 mice into C57BL/6 recipients. The effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins is studied in this model by assessment of proteinuria and autoantibodies as described above. T cell and responses B cell responses will also be evaluated.

Study IV: The MRL/lpr lupus prone mouse model is used. The effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins is studied in this model by assessment of proteinuria and autoantibodies as described above.

Example 46 The Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD IG Fusion Proteins in the Control of Intestinal Inflammation.

An adoptive transfer mouse model of colitis in mice is used, whereby Transfer of CD45RB^(high)-CD4+naïve T cells from BALB/c mice to syngeneic SCID mice leads to the development of an IBD-like syndrome by 6-10 wks after T cell reconstitution, similar to human Crohn's disease.

SCID mice are reconstituted by i.p. injection of syngeneic CD45RB^(high)-CD4⁺ T cells either alone or cotransferred with syngeneic CD45RB^(low)-CD4⁺ or CD25⁺CD4⁺ cells (4×10⁵/mouse of each cell population) (Liu et al., J Immunol. 2001; 167(3): 1830-8). Colitic SCID mice, reconstituted with syngeneic CD45RB^(high)CD4⁺ T cells from spleen of normal mice, are treated i.p. with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins or Ig isotype control, twice a week starting at the beginning of T cell transfer up to 8 wk. All mice are monitored weekly for weight, soft stool or diarrhea, and rectal prolapse. All mice are sacrificed 8 wk after T cell transfer or when they exhibit a loss of. 20% of original body weight. Colonic tissues are collected for histologic and cytologic examinations. LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins have a beneficial effect in at least ameliorating inflammatory bowel disease.

Example 47 The Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD IG Fusion Proteins in Mouse Model of Psoriasis Study I: Establishment of Psoriasis SCID Xenograft Model.

Human psoriasis plaques are transplanted on to the SCID mice. Shave biopsies (2.5_2.5 cm) are taken from patients with generalized plaque psoriasis involving 5-10% of the total skin that did not receive any systemic treatment for psoriasis or phototherapy for 6 months and did not receive any topical preparations other than emollients for 6 weeks. The biopsies are obtained from active plaques located on the thigh or arm. Each piece of biopsy is divided into four equal parts of approximately 1 cm2 size. Each piece is transplanted to a separate mouse.

Under general anesthesia, a graft bed of approximately 1 cm2 is created on the shaved area of the back of a 7- to 8-week-old CB17 SCID mouse by removing a full-thickness skin sample, keeping the vessel plexus intact on the fascia covering the underlying back muscles. The partial thickness human skin obtained by shave biopsy is then orthotopically transferred onto the graft bed. Nexaband, a liquid veterinary bandage (Veterinary Products Laboratories, Phoenix, Ariz.) is used to attach the human skin to the mouse skin and an antibiotic ointment (bacitracin) is applied. Mice are treated intraperitoneally three times per week for 4 weeks with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins, isotype control or CTLA4-Ig (positive control).

Punch biopsies (2 mm) are obtained on day 0 (before treatment) and day 28 (after treatment) of the study period. Biopsies are snap frozen and cryosections for histopathological and immunohistochemical studies. Therapeutic efficacy is determined by comparing pre- and post treatment data: (i) rete peg lengths to determine the effect on epidermal thickness and (ii) the level of lymphomononuclear cell infiltrates to determine the effect on inflammatory cellular infiltrates. (Raychaudhuri et al. 2008, J Invest Dermatol.; 128(8):1969-76; Boehncke et al., 1999 Arch Dermatol Res 291:104-6).

LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) have a beneficial effect in at least ameliorating psoriasis.

Study II: The Effect of LY6G6F, VSIG10, TMEM25 and LSR in Psoriasis and Colitis Model by Adoptive Transfer of CD45RBH CD4+ T Cells in SCID Mice

Immunocompromised mice are injected intraveneously (i.v.) with 0.3_10⁶ CD4+CD45RBhi cells. On the day following the adoptive transfer of cells, mice are injected intraperitoneally (i.p.) with 10 microg of staphylococcal enterotoxin B (Davenport et al., Int Immunopharmacol. 2002 April; 2(5):653-72). Recipient mice are treated with LY6G6F, VSIG10, TMEM25 or LSR ECD-Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively), isotype control or CTLA4-Ig (positive control). Mice are evaluated once a week for 8 weeks for weight loss and presence of skin lesions.

Obtained results are similar to those described above.

Example 48 The Effect of LY6G6F, VSIG10, TMEM25 and LSR ECD IG Fusion Proteins in Modulating Transplant Rejection. Study I: The Effect of LY6G6F, VSIG10, TMEM25 and LSR in a Model of Allogeneic Islet Transplantation in Diabetic Mice.

To test the effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins (SED ID NOs: 23, 24, 25 and 26, respectively) on transplant rejection, a model of allogeneic islet transplantation is used. Diabetes is induced in C57BL/6 mice by treatment with streptozotocin. Seven days later, the mice are transplanted under the kidney capsule with pancreatic islets which are isolated from BALB/c donor mice. Recipient mice are treated with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins or with mIgG2a as a negative control. Tolerance with ECDI-fixed donor splenocytes is used as the positive control for successful modulation islet graft rejection. Recipient mice are monitored for blood glucose levels as a measure of graft acceptance/rejection (Luo et al., PNAS, Sep. 23, 2008 vol. 105 no. 38 14527-14532).

Study II: The Effect of LY6G6F, VSIG10, TMEM25 and LSR in the HYA-Model of Skin Graft Rejection.

In humans and certain strains of laboratory mice, male tissue is recognized as non-self and destroyed by the female immune system via recognition of histocompatibility-Y chromosome encoded antigens (Hya). Male tissue destruction is thought to be accomplished by cytotoxic T lymphocytes in a helper-dependent manner.

To test the effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fused proteins (SED ID NOs: 23, 24, 25 and 26, respectively) on transplantation, the Hya model system is used, in which female C57BL/6 mice receive tail skin grafts from male C57BL/6 donors.

In this study, female C57BL/6 mice are engrafted with orthotopic split-thickness tail skin from age matched male C57BL/6 mice. The mice are treated with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins, isotype control mIgG2a. Immunodominant Hya-encoded CD4 epitope (Dby) attached to female splenic leukocytes (Dby-SP) serve as positive control for successful modulation of graft rejection (Martin et al., J Immunol. 2010 Sep. 15; 185(6): 3326-3336). Skin grafts are scored daily for edema, pigment loss and hair loss. Rejection is defined as complete hair loss and more than 80% pigment loss.

In addition, T cell recall responses of cells isolated from spleens and draining lymph nodes at different time points are studied in response to CD4 specific epitope (Dby), CD8 epitopes (Uty and Smcy) or irrelevant peptide (OVA 323-339) while anti CD3 stimulation is used as positive control for proliferation and cytokine secretion.

Study III: The effect of LY6G6F, VSIG10, TMEM25 and LSR ECD Ig fusion proteins on graft rejection is studied in a murine model of syngeneic bone marrow cells transplantation using the Hya model system described above. Male hematopoietic cells expressing the CD45.1 marker are transplanted to female host mice which express the CD45.2 congenic marker. Female hosts are treated with LY6G6F, VSIG10, TMEM25 or LSR ECD Ig fusion proteins or with isotype control mIgG2a. The female hosts are followed over time and the presence of CD45.1+ cells is monitored.

Example 49

Establishment of the Role of LY6G6F, VSIG10, TMEM25 and/or LSR Proteins According to at Least Some Embodiments of the Invention as Modulators of Cancer Immune Surveillance:

1) In Vivo Proof of Concept

a) Mouse Cancer Syngeneic Model:

(i) Tumor cells, over expressing any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins or a non-relevant control protein are transplanted to genetically matched mice. Tumor volume (and tumor weight after sacrificing the animals) and ex vivo analysis of immune cells from tumor draining lymph nodes or spleens are then examined to demonstrate the rejection of the tumor to be delayed (i.e. tumor over expressing LY6G6F, VSIG10, TMEM25 and/or LSR grow faster than tumors over expressing the non-relevant control protein). Ex vivo analysis of immune cells from tumor draining lymph nodes is expected to reveal an increase in the frequency of regulatory T cells and a decrease in the responsiveness of effector T cells to stimulation. (J. Exp. Med. 2011 Vol. 208 No. 3 577-592).

(ii) In vivo syngeneic model using the extra cellular domain of the mouse orthologs of any one of LY6G6F, VSIG10, TMEM25 and/or LSR protein fused to an antibody Fc fragment (mouse ECD-Fc) (SEQ ID NO: 23, 24, 25 and 26, respectively) is tested as follows. The mouse ECD-FC is injected IV to C57BL/6 mice at 3-4 day intervals, after tumor establishment, as described in J immunol 2010; 185; 2747-2753. Tumor volume (and tumor weight after sacrificing the animals) and ex vivo analysis of immune cells from tumor draining lymph nodes or spleens are then examined. As a result of IV treatment with Mouse ECD-FC of LY6G6F, VSIG10, TMEM25 and/or LSR the rejection of the tumor is delayed (i.e. in mice treated with the Mouse ECD-FC of LY6G6F, VSIG10, TMEM25 and/or LSR tumors grow faster than tumors in mice treated with non-relevant control protein). Ex vivo analysis of immune cells from tumor draining lymph nodes reveal an increase in the frequency of regulatory T cells and a decrease in the responsiveness of effector T cells to stimulation.

(iii) Establishment of a syngeneic tumor and treat with neutralizing antibodies directed against any one of LY6G6F, VSIG10, TMEM25 and/or LSR protein (1, 3, 5, 7, 11, 143, 13, 15-17, 18, 28, 29-32). Tumor cells are transplanted to genetically identical mice. After the establishment of tumors, mice are injected IV with different doses of neutralizing antibodies aimed against any one of LY6G6F, VSIG10, TMEM25 and/or LSR protein. As a result of IV treatment with neutralizing antibodies specific for any one of LY6G6F, VSIG10, TMEM25 and/or LSR protein the rejection of the tumor is increased (i.e. in mice treated with neutralizing antibodies against any one of LY6G6F, VSIG10, TMEM25 and/or LSR protein tumors grow slower than tumors in mice treated with non-relevant antibody). Ex vivo analysis of immune cells from tumor draining lymph nodes reveal a decrease in the frequency of regulatory T cells and an increase in the responsiveness of effector T cells to stimulation.

b) Human Cancer Xenograft Model:

(i) Reconstitution of the tumor immune response in a model of immune compromised NOD.Cg-Prkdcscid Il2rgtm1Wjl/SzJ mice (Jackson lab), “NSG” mice. Human tumor is established in NSG model, and APCs pre-loaded with Tumor antigens, or/and T cells (CD8 T cells pre-activated with cancer target cells are transferred into tumor bearing NSG mice (all cells transplanted/injected originate from cancer patients). This model consists of four arms: 1. APC's over expressing any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, 2. silencing of any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins (either siRNA or ShRNA) on APC's, 3. Cancer cells over expressing any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins and 4. Silencing of any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins (either siRNA or ShRNA) on cancer cells. Positive (e.g. B7-H1, PD-L1) and negative (e.g. Vector and cells alone) controls are included. Tumor volume or tumor metastasis and mouse survival are then examined (J. Exp. Med.; 2006; Vol. 203; p. 871-881). Over expression of any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins either on APC's or on Tumor cells, lead to delayed rejection of the tumor (i.e. in mice treated with the APC's or tumor cells over expressing any of LY6G6F, VSIG10, TMEM25 and/or LSR tumors grow faster than tumors in mice treated with non-relevant control protein). Silencing (with SiRNA or SHRNA) of any of LY6G6F, VSIG10, TMEM25 and/or LSR either on APC's or on tumor cells lead to enhanced rejection of the tumor.

(ii) Establishment of the NSG cancer Xenograft as described above (without genetic manipulation of APC's and/or cancer cells) and treatment with neutralizing antibodies directed against the any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins. Treatment of the NSG Xenograft model with neutralizing antibodies directed against any of LY6G6F, VSIG10, TMEM25 and/or LSR is gives rise to enhanced rejection of the tumor.

2) In Vitro Validation of Natural Killer (NK) Cell Activity

a) Binding Assay:

(i) Binding assay with human LY6G6F, VSIG10, TMEM25 and/or LSR ECD-FC proteins on activated primary-culture NK cells is performed as described in J Immunol 2005; 174; 6692-6701.If the counter receptor of LY6G6F, VSIG10, TMEM25 and/or LSR is expressed on NK cells, binding of LY6G6F, VSIG10, TMEM25 and/or LSR ECD-Fc is observed.

(ii) Binding assay with a specific antibody directed against the any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins on activated primary-culture NK cells is performed as described in PNAS, 2009, vol. 109; 17858-17863. If any one of LY6G6F, VSIG10, TMEM25 and/or LSR is expressed on NK cells, binding of LY6G6F, VSIG10, TMEM25 and/or LSR specific antibody, respectively, is observed.

(iii) Binding assay with human LY6G6F, VSIG10, TMEM25 and/or LSR ECD-FC proteins on various human cancer cell lines that may serve as target cells for NK killing is performed as described in J Immunol 2006; 176; 6762-6769. If the counter receptor of any one of LY6G6F, VSIG10, TMEM25 and/or LSR is expressed on the cancer target cells, binding of LY6G6F, VSIG10, TMEM25 and/or LSR ECD-Fc, respectively is observed.

b) Functional Killing Assay:

(i) Killing assays are performed using an over expression system (either NK cells or cancer target cells, over expressing any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins). The NK cells (effector; e) are co-incubated with radioactive (S35) labeled cancer target cells (target; t) in various e:t ratios, as described in PNAS, 2009, vol. 109; 17858-17863. Lysis of target cells by NK killing activity is then evaluated by measurement of radioactive emission. Over expression of any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins on the target cancer cells and/or the NK cell lines lead to down regulation of the NK mediated killing activity.

(ii) Killing assays are performed in the presence of the human LY6G6F, VSIG10, TMEM25 and/or LSR ECD-FC proteins, as described in PLoS ONE; 2010; Vol. 5; p. 1-10. Treatment with the ECD-Fc of any of LY6G6F, VSIG10, TMEM25 and/or LSR interfere with the interaction of LY6G6F, VSIG10, TMEM25 and/or LSR with their counter receptors and thus decrease their inhibitory activity, giving rise to enhanced killing activity.

(iii) Killing assays are performed in the presence of a neutralizing antibody directed against any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, as described in PNAS, 2009, vol. 109; 17858-17863. Treatment with neutralizing antibodies directed towards any of LY6G6F, VSIG10, TMEM25 and/or LSR, give rise to enhanced NK killing activity.

(iv) “Re-directed killing assay” is performed as follows: cancer target cells expressing high density Fc receptors are coated with activating antibodies directed against any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins and exposed to NK cells (expressing the designated LY6G6F, VSIG10, TMEM25 and/or LSR protein), as described in PNAS, 2009, vol. 109; 17858-17863. Cross linking of any one of LY6G6F, VSIG10, TMEM25 and/or LSR with activating antibodies give rise to reduced NK mediated killing activity.

3) Expression Analysis

a) Expression of LY6G6F, VSIG10, TMEM25 and/or LSR Proteins on Cells Isolated from Human Tumor Biopsies

i) Expression validation of any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins using specific antibodies directed against the any one of LY6G6F, VSIG10, TMEM25 and/or LSR proteins, respectively, is carried out on separated cell populations from the tumor. Various cell populations are freshly isolated from tumor biopsies (e.g. Tumor cells, endothelia, tumor associated macrophages (TAMs) and DCs, B cells and different T cells (CD4, CD8 and Tregs) as described in J. Exp. Med.; 2006; Vol. 203; p. 871-881 and Cancer res. 2007; 67; 8900-8905, to demonstrate expression of any of LY6G6F, VSIG10, TMEM25 and/or LSR in tumor cells and on tumor stroma and immune infiltrate.

ii) Binding assay is performed with the human LY6G6F, VSIG10, TMEM25 and/or LSR ECD-FC proteins on separated cell populations from the tumor. Isolate various cell populations from tumor biopsies (e.g. Tumor cells, endothelia, tumor associated macrophages (TAMs) and DCs, B cells and different T cells (CD4, CD8 and Tregs) freshly isolated from tumors as described in J. Exp. Med.; 2006; Vol. 203; p. 871-881 and Cancer res. 2007; 67; 8900-8905, to show expression of the counter receptor for any of LY6G6F, VSIG10, TMEM25 and/or LSR in tumor cells and on tumor stroma and immune cells.

b) Expression of LY6G6F, VSIG10, TMEM25 and/or LSR Proteins on Cells Isolated from Draining Lymph Nodes and Spleens of Tumor Bearing Mice

(i) Expression validation of LY6G6F, VSIG10, TMEM25 and/or LSR proteins using specific antibodies directed against LY6G6F, VSIG10, TMEM25 and/or LSR proteins, respectively, is done on epithelial cancer cells as well as on immune cells from tumor draining lymph nodes vs. spleen of tumor bearing C57 mice, as described in Clinical Cancer Research 1996 Vol. 2, 811-820. Three different cancer types are being tested: B16 (melanoma), ID8 (ovarian) and MC38 (colon)), to show expression of any of LY6G6F, VSIG10, TMEM25 and/or LSR in tumor cells and in immune cells in the tumor draining lymph node.

ii) Binding assay with mouse LY6G6F, VSIG10, TMEM25 and/or LSR ECD-FC proteins on cells isolated from epithelial cancer as well as on immune cells from tumor draining lymph nodes versus spleen of tumor bearing C57 mice, is carried out as described above, to show expression of the counter receptor for any of LY6G6F, VSIG10, TMEM25 and/or LSR in tumor cells and in immune cells in the tumor draining lymph node.

c) Expression of LY6G6F, VSIG10, TMEM25 and/or LSR Proteins on M2 Polarized Macrophages

(i) Expression validation of LY6G6F, VSIG10, TMEM25 and/or LSR proteins using specific antibodies directed against LY6G6F, VSIG10, TMEM25 and/or LSR proteins, respectively, is done on primary monocytes isolated from peripheral blood, differentiated into macrophages and exposed to “M2 driving stimuli” (e.g. IL4, IL10, Glucocorticoids, TGF beta), as described in Nat. Immunol. 2010; Vol. 11; p. 889-896, to show expression of any of LY6G6F, VSIG10, TMEM25 and/or LSR in M2 differentiated Macrophages.

ii) Binding assay with LY6G6F, VSIG10, TMEM25 and/or LSR human ECD-FC proteins on primary monocytes isolated from peripheral blood, differentiated into macrophages and exposed to “M2 driving stimuli” (e.g. IL4, IL10, Glucocorticoids, TGF beta) is carried out as described above, to show expression of the counter receptor for any of LY6G6F, VSIG10, TMEM25 and/or LSR in M2 differentiated Macrophages.

Example 50

Development of Fully Human Anti-LY6G6F, Anti-VSIG10, Anti-TMEM25 and/or ANTI-LSR Antibodies

Generation Of Human Monoclonal Antibodies Against LY6G6F, VSIG10, TMEM25 and/or LSR Antigen

Fusion proteins composed of the extracellular domain of the LY6G6F, VSIG10, TMEM25 and/or LSR linked to a mouse IgG2 Fc polypeptide are generated by standard recombinant methods and used as antigen for immunization.

Transgenic HuMab Mouse.

Fully human monoclonal antibodies to LY6G6F, VSIG10, TMEM25 and/or LSR are prepared using mice from the HCo7 strain of the transgenic HuMab Mouse®, which expresses human antibody genes. In this mouse strain, the endogenous mouse kappa light chain gene has been homozygously disrupted as described in Chen et al. (1993) EMBO J. 12:811-820 and the endogenous mouse heavy chain gene has been homozygously disrupted as described in Example 1 of PCT Publication WO 01/09187. Furthermore, this mouse strain carries a human kappa light chain transgene, KCo5, as described in Fishwild et al. (1996) Nature Biotechnology 14:845-851, and a human heavy chain transgene, HCo7, as described in U.S. Pat. Nos. 5,545,806; 5,625,825; and 5,545,807.

HuMab Immunizations:

To generate fully human monoclonal antibodies to LY6G6F, VSIG10, TMEM25 and/or LSR, mice of the HCo7 HuMab Mouse strain can be immunized with purified recombinant LY6G6F, VSIG10, TMEM25 and/or LSR fusion protein derived from mammalian cells that are transfected with an expression vector containing the gene encoding the fusion protein. General immunization schemes for the HuMab Mouse are described in Lonberg, N. et al (1994) Nature 368(6474): 856-859; Fishwild, D. et al. (1996) Nature Biotechnology 14: 845-851 and PCT Publication WO 98/24884. The mice are 6-16 weeks of age upon the first infusion of antigen. A purified recombinant LY6G6F, VSIG10, TMEM25 and/or LSR antigen preparation (5-50.mu.g, purified from transfected mammalian cells expressing LY6G6F, VSIG10, TMEM25 and/or LSR fusion protein) is used to immunize the HuMab mice intraperitoneally.

Transgenic mice are immunized twice with antigen in complete Freund's adjuvant or Ribi adjuvant IP, followed by 3-21 days IP (up to a total of 11 immunizations) with the antigen in incomplete Freund's or Ribi adjuvant. The immune response is monitored by retroorbital bleeds. The plasma is screened by ELISA (as described below), and mice with sufficient titers of anti-LY6G6F, VSIG10, TMEM25 and/or LSR human immunoglobulin are used for fusions. Mice are boosted intravenously with antigen 3 days before sacrifice and removal of the spleen.

Selection of HuMab Mice Producing Anti-LY6G6F, Anti-VSIG10, Anti-TMEM25 and/or Anti-LSR Antibodies:

To select HuMab mice producing antibodies that bind LY6G6F, VSIG10, TMEM25 and/or LSR sera from immunized mice is tested by a modified ELISA as originally described by Fishwild, D. et al. (1996). Briefly, microtiter plates are coated with purified recombinant LY6G6F, VSIG10, TMEM25 and/or LSR fusion protein at 1-2.mu.g/ml in PBS, 50.mu./wells incubated 4 degrees C. overnight then blocked with 200.mu.l/well of 5% BSA in PBS. Dilutions of plasma from LY6G6F, VSIG10, TMEM25 and/or LSR-immunized mice are added to each well and incubated for 1-2 hours at ambient temperature. The plates are washed with PBS/Tween and then incubated with a goat-anti-human kappa light chain polyclonal antibody conjugated with alkaline phosphatase for 1 hour at room temperature. After washing, the plates are developed with pNPP substrate and analyzed by spectrophotometer at OD 415-650. Mice that developed the highest titers of anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies are used for fusions. Fusions are performed as described below and hybridoma supernatants are tested for anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR activity by ELISA.

Generation of Hybridomas Producing Human Monoclonal Antibodies to LY6G6F, VSIG10, TMEM25 and/or LSR.

The mouse splenocytes, isolated from the HuMab mice, are fused with PEG to a mouse myeloma cell line based upon standard protocols. The resulting hybridomas are then screened for the production of antigen-specific antibodies. Single cell suspensions of splenic lymphocytes from immunized mice are fused to one-fourth the number of P3X63 Ag8.6.53 (ATCC CRL 1580) nonsecreting mouse myeloma cells with 50% PEG (Sigma). Cells are plated at approximately 1×10-5/well in flat bottom microtiter plate, followed by about two week incubation in selective medium containing 10% fetal calf serum, supplemented with origen (IGEN) in RPMI, L-glutamine, sodium pyruvate, HEPES, penicillin, streptamycin, gentamycin, 1×HAT, and beta-mercaptoethanol. After 1-2 weeks, cells are cultured in medium in which the HAT is replaced with HT. Individual wells are then screened by ELISA (described above) for human anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSRmonoclonal IgG antibodies. Once extensive hybridoma growth occurred, medium is monitored usually after 10-14 days. The antibody secreting hybridomas are replated, screened again and, if still positive for human IgG, anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR monoclonal antibodies are subcloned at least twice by limiting dilution. The stable subclones are then cultured in vitro to generate small amounts of antibody in tissue culture medium for further characterization.

Hybridoma clones are selected for further analysis.

Structural Characterization of Desired Anti-LY6G6F, Anti-VSIG10, Anti-TMEM25 and/or Anti-LSR Human Monoclonal Antibodies

The cDNA sequences encoding the heavy and light chain variable regions of the obtained anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSRmonoclonal antibodies are obtained from the resultant hybridomas, respectively, using standard PCR techniques and are sequenced using standard DNA sequencing techniques.

The nucleotide and amino acid sequences of the heavy chain variable region and of the light chain variable region are identified. These sequences may be compared to known human germline immunoglobulin light and heavy chain sequences and the CDRs of each heavy and light of the obtained anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR sequences identified.

Characterization Of Binding Specificity And Binding Kinetics Of Anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR Human Monoclonal Antibodies

The binding affinity, binding kinetics, binding specificity, and cross-competition of anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSRantibodies are examined by Biacore analysis. Also, binding specificity is examined by flow cytometry.

Binding Affinity and Kinetics

Anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies produced according to the invention are characterized for affinities and binding kinetics by Biacore analysis (Biacore AB, Uppsala, Sweden). Purified recombinant human LY6G6F, VSIG10, TMEM25 and/or LSR fusion protein is covalently linked to a CMS chip (carboxy methyl dextran coated chip) via primary amines, using standard amine coupling chemistry and kit provided by Biacore. Binding is measured by flowing the antibodies in HBS EP buffer (provided by BIAcore AB) at a concentration of 267 nM at a flow rate of 50.mu.l/min. The antigen-association antibodies association kinetics is followed for 3 minutes and the dissociation kinetics is followed for 7 minutes. The association and dissociation curves are fit to a 1:1 Langmuir binding model using BIAevaluation software (Biacore AB). To minimize the effects of avidity in the estimation of the binding constants, only the initial segment of data corresponding to association and dissociation phases are used for fitting.

Epitope Mapping of Obtained Anti-LY6G6F, Anti-VSIG10, Anti-TMEM25 and/or Anti-LSR Antibodies

Biacore is used to determine epitope grouping of anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR HuMAbs. Obtained anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies are used to map their epitopes on the LY6G6F, VSIG10, TMEM25 and/or LSR antigen, respectively. These different antibodies are coated on three different surfaces of the same chip to 8000 RUs each. Dilutions of each of the mAbs are made, starting at 10 mu.g/mL and is incubated with Fc fused LY6G6F, VSIG10, TMEM25 and/or LSR (50 nM) for one hour. The incubated complex is injected over all the three surfaces (and a blank surface) at the same time for 1.5 minutes at a flow rate of 20.mu.L/min. Signal from each surface at end of 1.5 minutes, after subtraction of appropriate blanks, has been plotted against concentration of mAb in the complex. Upon analysis of the data, the anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies are categorized into different epitope groups depending on the epitope mapping results. The functional properties thereof are also compared.

Chinese hamster ovary (CHO) cell lines that express LY6G6F, VSIG10, TMEM25 and/or LSR protein at the cell surface are developed and used to determine the specificity of the LY6G6F, VSIG10, TMEM25 and/or LSR HuMAbs by flow cytometry. CHO cells are transfected with expression plasmids containing full length cDNA encoding a transmembrane forms of LY6G6F, VSIG10, TMEM25 and/or LSR antigen or a variant thereof. The transfected proteins contained an epitope tag at the N-terminus are used for detection by an antibody specific for the epitope. Binding of a anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR MAb is assessed by incubating the transfected cells with each of the LY6G6F, VSIG10, TMEM25 and/or LSR Abs at a concentration of 10 mu.g/ml. The cells are washed and binding is detected with a FITC-labeled anti-human IgG Ab. A murine anti-epitope tag Ab, followed by labeled anti-murine IgG, is used as the positive control. Non-specific human and murine Abs are used as negative controls. The obtained data is used to assess the specificity of the HuMAbs for the LY6G6F, VSIG10, TMEM25 and/or LSR antigen target.

These antibodies and other antibodies specific to LY6G6F, VSIG10, TMEM25 and/or LSR may be used in the afore-described anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR related therapies such as treatment of cancers wherein LY6G6F, VSIG10, TMEM25 and/or LSR antigen is differentially expressed and/or for modulating (enhancing or inhibiting) B7 immune co-stimulation involving the LY6G6F, VSIG10, TMEM25 and/or LSR antigen such as in the treatment of cancers and autoimmune diseases wherein such antibodies will e.g., prevent negative stimulation of T cell activity against desired target cancer cells or prevent the positive stimulation of T cell activity thereby eliciting a desired anti-autoimmune effect.

The invention has been described and various embodiments provided relating to manufacture and selection of desired anti-LY6G6F, anti-VSIG10, anti-TMEM25 and/or anti-LSR antibodies for use as therapeutics and diagnostic methods wherein the disease or condition is associated with LY6G6F, VSIG10, TMEM25 and/or LSR antigen. Different embodiments may optionally be combined herein in any suitable manner, beyond those explicit combinations and subcombinations shown herein. The invention is now further described by the claims which follow. 

What is claimed is:
 1. A method for treating a subject in need thereof for cancer, the method comprising administering to the subject a monoclonal or polyclonal antibody or an antigen binding fragment thereof comprising an antigen binding site that binds specifically to an isolated polypeptide consisting essentially of an amino acid sequence as set forth in any one of SEQ ID NOs: 3, 4 or
 60. 2. The method of claim 1, wherein the treatment is combined with another moiety or therapy useful for treating cancer.
 3. The method of claim 2, wherein the therapy is radiation therapy, antibody therapy, chemotherapy, photodynamic therapy, adoptive T cell therapy, Treg depletion, surgery or combination therapy with conventional drugs.
 4. The method of claim 2, wherein the moiety is immunosuppressants, cytotoxic drugs, tumor vaccines, antibodies peptides, peptibodies, small molecules, chemotherapeutic agents or immunological modifiers.
 5. The method of claim 4, wherein the chemotherapeutic agent is cytotoxic or cytostatic agents.
 6. The method of claim 5, wherein the cytotoxic or cytostatic agent is paclitaxel, cisplatin, vinorelbine, docetaxel, gemcitabine, temozolomide, irinotecan, 5FU or carboplatin.
 7. The method of claim 4, wherein the immunological modifier is interferons and interleukins, immunostimulatory antibodies, growth hormones, cytokines, folic acid, vitamins, minerals, aromatase inhibitors, RNAi, Histone Deacetylase Inhibitors or proteasome inhibitors
 8. The method of claim 1, wherein the cancer is breast cancer, cervical cancer, ovary cancer, endometrial cancer, melanoma, bladder cancer, lung cancer, pancreatic cancer, colon cancer, prostate cancer, leukemia, acute lymphocytic leukemia, chronic lymphocytic leukemia, B-cell lymphoma, Burkitt's lymphoma, multiple myeloma, Hodgkin's lymphoma, Non-Hodgkin's lymphoma, myeloid leukemia, acute myelogenous leukemia (AML), chronic myelogenous leukemia, thyroid cancer, thyroid follicular cancer, myelodysplastic syndrome (MDS), fibrosarcomas and rhabdomyosarcomas, uveal melanoma, teratocarcinoma, neuroblastoma, glioma, glioblastoma, keratoacanthomas, renal cancer, anaplastic large-cell lymphoma, esophageal squamous cells carcinoma, hepatocellular carcinoma, follicular dendritic cell carcinoma, intestinal cancer, muscle-invasive cancer, seminal vesicle tumor, epidermal carcinoma, spleen cancer, head and neck cancer, stomach cancer, liver cancer, bone cancer, brain cancer, cancer of the retina, biliary cancer, small bowel cancer, salivary gland cancer, cancer of uterus, cancer of testicles, cancer of connective tissue, myelodysplasia, Waldenstrom's macroglobinaemia, nasopharyngeal cancer, neuroendocrine cancer, mesothelioma, angiosarcoma, Kaposi's sarcoma, carcinoid, oesophagogastric, fallopian tube cancer, peritoneal cancer, papillary serous mullerian cancer, malignant ascites, gastrointestinal stromal tumor (GIST), or Von Hippel-Lindau syndrome (VHL), and wherein the cancer is non-metastatic, invasive or metastatic.
 9. The method of claim 8, wherein the cancer is any of melanoma, cancer of liver, renal, brain, breast, colon, lung, ovary, pancreas, prostate, stomach, multiple myeloma, Hodgkin's lymphoma, non Hodgkin's lymphoma, acute and chronic lymphoblastic leukemia and acute and chronic myeloid leukemia.
 10. A method of performing one or more of the following in a subject: a. increasing immune response, b. upregulating pro-inflammatory cytokines; c. inducing proliferation and/or expansion of T cells and/or NK cells; d. promoting T cells and/or NK cell activity; e. promoting antigenic specific T cell immunity; f. promoting CD4+ and/or CD8+ T cell activation; g. increasing interferon-.gamma. or TNF-.alpha. production by T-cells; h. increasing IL-2 secretion; i. alleviating T-cell suppression; and/or j. increasing cytotoxic T cell activity, comprising administering a monoclonal or polyclonal antibody or an antigen binding fragment thereof comprising an antigen binding site that binds specifically to an isolated polypeptide consisting essentially of an amino acid sequence as set forth in any one of SEQ ID NOs: 3, 4 and 60 to the subject. 